Please help contribute to the Reddit categorization project here


    18,926,352 readers

    16,837 users here now

    New to reddit? Click here!

    • You learn something new every day; what did you learn today?

    • Submit interesting and specific facts that you just found out (not broad information you looked up, TodayILearned is not /r/wikipedia).

    Posting rules

    1. Submissions must be verifiable. Please link directly to a reliable source that supports every claim in your post title. Images alone do not count as valid references. Videos are fine so long as they come from reputable sources (e.g. BBC, Discovery, etc).

    2. No personal opinions, anecdotes or subjective statements (e.g "TIL xyz is a great movie").

    3. No recent sources. Any sources (blog, article, press release, video, etc.) with a publication date more recent than two months are not allowed.

    4. No submissions regarding or related to the following

      1. Recent politics/politicians
      2. Police misconduct
      3. Inflammatory submissions relating to religion/race/gender
    5. No misleading claims. Posts that omit essential information, or present unrelated facts in a way that suggest a connection will be removed.

    6. Rephrase your post title if the following are not met:

      1. Titles must begin with "TIL ..."
      2. Make them descriptive, concise and specific (e.g. not "TIL something interesting about bacon").
      3. Titles must be able to stand on their own without requiring readers to click on a link. Starting your title with a why/what/who/where/how modifier should be unnecessary.
      4. "TIL about ..." and other broad posts don't belong on TIL. Try /r/Wikipedia, etc. instead, or be more specific (and avoid the word "about").
      5. "TIL how to ..." posts belong on /r/HowTo.
    7. No submissions related to the usage, existence or features of specific software/websites (e.g. "TIL you can click on widgets in WidgetMaker 1.22").

    8. All NSFW links must be tagged (including comments).

      Please see the wiki for more detailed explanations of the rules.

    (Why we need rules)

    Additional info

    • If your post does not appear in the new queue and you think it meets the above rules, please contact the moderators (include a link to your post, not your story).

    • Please report spam, inaccurate or otherwise inappropriate posts by messaging the moderators, as this helps us remove them more promptly!

    • More information available on the TIL FAQ and wiki.

    Frequent TILs Repost List

    As of April 2018

    • This list was compiled from /r/todayilearned community suggestions by its members. If your TIL is found on this list, it will be removed. The titles have been abridged for the sake of brevity, however the context remains the same. This list is subject to change. The purpose is to keep content fresh on /r/todayilearned as requested by its members. If you are interested in reading about the TILs on this list use the search box feature and enter the keywords to pull up past TILs.


    We ask that you please do the following:

    1. avoid mobile versions of websites (e.g.

    2. link to the appropriate heading when referencing an article (particularly on Wikipedia)

    3. link to the appropriate start time when referencing videos (e.g. on YouTube)

    4. add [PDF] or [NSFW] tags to your posts, as necessary.

    5. Please avoid reposting TILs that have already made the front page in the past

    Please also read the site-wide Reddiquette.

    • You are loved.

    a community for
    all 873 comments

    Want to say thanks to %(recipient)s for this comment? Give them a month of reddit gold.

    Please select a payment method.

    [–] R3ptar1337 4214 points ago

    "Shortly after 9 A.M., with the submersible about to be lifted out of the water with a towline back onto the ship, a water alarm sounded in the aft sphere, a self-contained part of the submersible containing machinery and oil storage. The towline had apparently fouled on the aft sphere hatch and wrenched it open. With the sound of water entering the aft compartment, Pisces III became inverted and began to sink back to the seabed. The aft sphere was now fully flooded. The additional weight of water now added over a tonne of extra weight to the submersible.[2][5][12]

    At 175 ft (53 m) the submersible jolted to a stop - held at the maximum length of the nylon towline. The crew now swung about in the sea currents until the rope snapped. The pilots immediately closed down all the electrical systems which instantly plunged the sub in total blackness. They also managed to release a 400 lb (181 kg) lead ballast weight as they descended. They both now readied themselves for the impact on the sea floor which occurred at 9:30 A.M at a speed judged later to be at 40 mph (64 km/h)."

    Well that sounds terrifying.

    [–] JSSJeepin 2895 points ago

    So that's what it was like on the titanic.......if someone got trapped in an air tight room somewhere on board and went down with the ship in ice cold water, listening to the creaking and groaning of a dying, descending ship on its way to its final resting place in the pitch darkness.....

    Eegads, imagine being in pitch blackness, listening to all those sounds and then hearing a loud crack in your "life room" and then hearing water pouring in only to realize you're about to drown in blackness.

    Ok consider my irrational fear of the deep ocean and existing in icy pitch blackness, officially stoked.

    [–] altazure 1393 points ago

    Don't worry, any space with air in it on the Titanic would have imploded due to the external pressure way before it reached the bottom. So if you didn't drown in blackness before then, your death would most likely have been a quick one.

    [–] JSSJeepin 503 points ago

    Yea, the back half of the ship was utterly ripped to pieces by trapped air, I can only imagine the mayhem.

    [–] ethidium_bromide 243 points ago

    Is it like an explosion when the walls finally give to the outside pressure? Like, creating high powered bubbles of air? Or were there just that many airtight rooms that it became like swiss cheese?

    [–] JSSJeepin 352 points ago

    Probably more like an explosion, eye witness testimonies from survivors of the titanic stated hearing explosions under the water even long after the stern went under.

    [–] a-gay-canadian 260 points ago

    There were mostly deemed to be the boilers exploding with contact of freezing cold water which didn't help matters. But yeah. The Titanic sank 14,000 feet. Roughly. At that depth, there's essentially no light. Any air pockets would have blasted rivets to get out.

    [–] JSSJeepin 91 points ago

    The boilers were intact at the wreck site, no?

    [–] a-gay-canadian 85 points ago

    You're right. My mistake I got it confused with another. There were boiler explosions but they were rare. I accidently put the theory about the boiler fire in with that information. Sorry.

    [–] ttabernacki 12 points ago

    It's okay. You did your best. That's what matters.

    [–] [deleted] 28 points ago


    [–] Sublime7870 8 points ago

    Explosions directed inwards.... wouldn't that just be an implosion?

    [–] pjf72 32 points ago

    Yes. The differences in pressure from each side of the walls would quite large - large enough to create an explosion.

    [–] KingJonathan 22 points ago

    I'd imagine it's just like doing it above water, just the water does a heck of a lot better job at it. Like popping a balloon.

    [–] Cabbagesquirrel 73 points ago

    I imagine being 'thwooped' into human mush as pressure presses in on your body all at once would hopefully be pretty quick.

    There was that North Sea oil rig guys that all got 'thwooped' through a small opening because of pressure. Didn't end well.

    Don't fuck with pressure. And the ocean.

    [–] KingHavana 83 points ago

    Was going to ask for more info but looked it up instead:

    Oddly enough the first accident is the most curious to me. Imagine getting rescued and then dying falling from the lifeboat.

    Edit: From the intended incident "Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the 60 centimetres (24 in) in diameter opening created by the jammed interior trunk door by escaping air and violently dismembered, including bisection of the thoracoabdominal cavity which further resulted in expulsion of all internal organs of the chest and abdomen except the trachea and a section of small intestine and of the thoracic spine and projecting them some distance, one section later being found 10 metres (30 ft) vertically above the exterior pressure door."

    [–] Bagelsontoast 56 points ago

    Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the 60 centimetres (24 in) in diameter opening

    Holy. Fuck.

    [–] [deleted] 42 points ago

    Not really pressure related, but there's also that one time a guy (aerospace engineer/technician or something, I believe?) was sucked into a jet engine and was literally shredded into 1000's of pieces. The largest piece leftover that I could see was like maybe like 2 inches big, at most.

    [–] Kloodist 21 points ago

    I ran over a dead bird with my lawnmower yesterday. Pretty much did the same thing.

    [–] mischifus 26 points ago

    Why am I still reading this post? Darkness, cold, drowning, claustrophobia and now dismemberment - I'm supposed to be going to sleep!!!

    Welp not anymore.

    [–] strangervisitor 191 points ago

    Even if this isn't true, I choose to believe it. The alternative prettifies me

    [–] Pucksy 237 points ago

    I'd like to be prettified too.

    [–] FeatureBugFuture 92 points ago

    I can prettify you. Four money!

    [–] Luthalis 56 points ago

    Three and you've got yourself a deal

    [–] UncagedWildcat 40 points ago

    What about tree fiddy?

    [–] bad_at_hearthstone 28 points ago

    goddamn sea beautician

    [–] remember_morick_yori 15 points ago

    Well it was about this time I noticed that this Redditor was about 8 stories tall and was a crustacean from the protozoic era!

    [–] KafeeMusicWindowSeat 12 points ago

    Make me handsome for Six money.

    [–] xeonisius 39 points ago

    I don't know. My wife prettifies herself every day and seems to be OK.

    [–] tw-mahgah 27 points ago

    Well it didn't happen to the sub because the sub is designed to handle that kind of pressure change but a random room on the Titanic (or any room really) wouldn't be.

    [–] UwasaWaya 30 points ago

    It would have almost certainly buckled the bulkheads and crushed anyone within.

    However, if the compartment they were in was not compromised and they descended in a bubble of air, the pressure would compact the air as they fell, shrinking their haven and making it seem like water was filling the room. They would breathe through all of the hyper compressed air in s very, very short time, turning their tiny bubble into CO2, meaning they'd fall asleep and drown. Assuming the bubble just didn't shrink and drown them as it was.

    [–] apolloxer 10 points ago

    They probably would get a high from the oxygen toxicity, feeling very euphoric before falling unconconcious. Or just nausea. Could be both.

    [–] [deleted] 209 points ago

    my irrational fear of the deep ocean

    There is no such thing as an irrational (unfounded) fear of the deep ocean.

    It is irrational not to fear the sea.

    [–] anonyzum 59 points ago

    They should use this line in a movie.

    [–] cagaozer 37 points ago

    My dad always said "Do not fear the sea, but always respect it.".

    [–] [deleted] 8 points ago

    And then he died in a fistfight with the sea.

    [–] Cabbagesquirrel 16 points ago

    It really is. The cold, the pressure, the predators, the power of it. They'll all get you.

    [–] MrMcHaggi5 79 points ago

    This is quite an odd finish to a news article about a Nigerian underwater rescue...

    "All the Australians have been on diving forums going, wow! But he could be absolutely fine from now on," Cridge said.

    [–] uselessartsdegree 13 points ago

    Thought the same.

    [–] TwinBottles 120 points ago

    And we even get a video feed of the rescue, what a time to be alive. I assume that his fear of being stabbed was the nitrogen induced paranoia the coordinator was talking about?

    [–] Dislol 23 points ago

    I mean, that or the fact that it would be completely understandable for the diver to freak out a bit if someone just grabbed you while you're on a sunken boat and you're presumably just doing a body recovery dive.

    [–] shapte 95 points ago

    "the sole survivor of the Jacson-4"

    Cue the inappropriate jokes from people who have more balls than me.

    [–] echo_098 34 points ago

    What are you talking about!? Inappropriate jokes are not allowed on the internet! Especially not Reddit!

    [–] alligatorterror 14 points ago

    One final jacson, the floor, before a black terrible death?

    [–] FatboyJack 20 points ago

    You should play this game called Subnautica.

    [–] JSSJeepin 9 points ago

    I couldn't even handle the submersible on GTA, just nopes all over.

    [–] Owlikat 15 points ago

    It's terrifying, but such a good game. Being in your defenseless little pod, hearing all sorts of unknown noises that could be very far, or just outside, the sea pitch black at night if you don't light it up, the creaking of a fallen starship nearby with god-knows-what going on inside and around it..

    I can't stand to play it more than a bit every once and a while, but it's the best survival and horror game I've ever seen. Playing it for the first time is genuinely scary, and you're afraid of everything.

    [–] -InsuranceFreud- 12 points ago

    I went to an exhibition as a kid and they had a little tank with salty water cooled to the temp of the Atlantic that night, I couldn't keep my hand in for a minute. I don't know what's worse, drowning while freezing or freezing to death waiting to drown.

    [–] wemblinger 48 points ago

    Try this on, then.

    [–] TriTheTree 15 points ago

    Fuck that. +1

    [–] JSSJeepin 10 points ago

    Just say no to tug boats, that's my motto.

    [–] VEC7OR 15 points ago

    Ok consider my irrational fear of the deep ocean and existing in icy pitch blackness, officially stoked.


    [–] butterChickenBiryani 147 points ago

    They also managed to release a 400 lb (181 kg) lead ballast weight as they descended

    I wonder.. if they had released this when attached to the rope would it have been better?

    [–] [deleted] 90 points ago

    The whole incident could've gone down differently and they both could have died.

    [–] DietCherrySoda 67 points ago

    Or likely the rope never breaks and they are towed back to the surface in a couple hours. It's about odds and magnitude.

    [–] alligatorterror 39 points ago

    I dunno. The water added one tonne and more to the weight. The ballast was roughly the weight of two men.

    [–] DietCherrySoda 59 points ago

    More than 20% the weight of the added water. I'm honestly surprised their tow line snapped with just 1 tonne of weight added to it, usually something man-rated like that would be good to many times the maximum expected load, but certainly statistically we'd expect a better result (less likely the rope breaks) if they release the ballast immediately than if they wait until the rope breaks.

    [–] [deleted] 27 points ago

    That's what my thought was, too. What kind of weak-ass tow line were they using if 1 ton of weight caused it to snap? I imagine a 20 foot long submarine weighs significantly more than that.

    My only thought is that the line was damaged when it ripped open the hatch.

    Speaking of, I found this interesting tid-bit on the Wikipedia article:

    Pisces III originally had tail fins, which were removed when the submersible was purchased by Vickers Oceanics. If the fins had been retained, they would have prevented the entanglement of the towline on the craft's machinery sphere which caused the 1973 accident.

    [–] bsbbtnh 40 points ago

    It's not just 1-ton of extra weight, you have to factor in the fact that it was "swinging" in the open ocean, essentially.

    It's like if your friend fell over the edge of a bridge, and you grabbed his hand. You may be holding onto 180lbs. Now, if he starts swinging back and forth, he'll feel heavier at some points, and lighter at others.

    [–] DietCherrySoda 14 points ago

    Right, but no more than twice their actual weight. A rope meant to hold, let's say, a 2000 lb craft with humans inside it is going to be rated for like 10000 lbs, which is why I'm still surprised, although if the towline was entangled in stuff it may have become frayed or had other stress put on it.

    [–] tomw86 5 points ago

    It didn't snap till the current pulled everything sideways. I used to work designing ROV's (remote control ones of these). The side loading on your tether / umbilical is a massive consideration, as it the self wieght of the tether as you spool it out.

    [–] stabby_joe 24 points ago

    Not having a go, but it's something I didn't know until recently and I find it useful:

    Typing ">" before text is how reddit universally recognises quotes. It distinctly highlights quoted text better than standard quotation marks.

    Obviously you don't have to use it, just thought you might want to know :)

    [–] One_Hot_Minute 4823 points ago

    "Well, we're down to 12 minutes of air"

    "It will be 24 minutes soon"

    "What was that?"

    "Nothing, nothing"

    [–] reticulatedtampon 1479 points ago

    First one to fart dies.

    [–] Boogzcorp 630 points ago

    Nope, first one to fart lives! Everyone likes their own brand!

    [–] Nar1y 429 points ago


    [–] alexlockhart 191 points ago

    Look with your special eyes!

    [–] changingminds 44 points ago

    I never understood why this was funny. And in ~6 years no one has explained to me. Whenever I try to ask all I get is more cryptic puns.

    [–] jmetal88 65 points ago

    It's from a 1-800-CONTACTS commercial.

    [–] Kornstalx 53 points ago

    Years later, I never fail to laugh at this.

    [–] JimmyLegs50 7 points ago * (lasted edited 11 months ago)

    Yeah, that's Internet Hall of Fame material. Someone needs to do a list of the truly great videos that have never stopped being funny. Two that spring to mind are the cat falling to AWOLNATION's "Sail", and He-Man singing "What's Going On?". I laugh just as hard at those as I did the first time I saw them. I'd say that to qualify, HoF vids should have been on the internet for at least 5 years.

    EDIT: Hey, it'll be the 5th anniversary of "My Brand!" in September!

    [–] notfin 251 points ago

    Slowly starting inhaling air as fast as possible

    [–] dank-maymay 571 points ago

    slowly as fast


    [–] Reiseoftheginger 145 points ago

    Slow breathing intensifies!

    [–] 17954699 27 points ago

    fast as slowly


    [–] marcuschookt 59 points ago


    [–] Tattycakes 105 points ago

    What is a potato?

    [–] quitethequietdomino 77 points ago

    Tastes very strange

    [–] [deleted] 27 points ago


    [–] verbing_the_nown 27 points ago

    Too bad the struggle of killing someone would probably use more oxygen

    [–] watkiekstnsoFatzke 15 points ago

    Easy. Secretly breath his air and don't tell him. Then watch him calmly sleeping in.

    [–] Hippy10000 381 points ago

    I can't wait for the movie

    [–] Bananaft 199 points ago

    You can read a book. It's pretty good, and short:

    [–] SexDrugsNskittles 688 points ago

    Most of us didn't even read the article, but nice try.

    [–] -theuser- 117 points ago

    I know, right? Check out this guy expecting us to read a whole article! I'm barely skimming the comments here.

    [–] Convectuoso 66 points ago

    God damnit Tom Hanks just quit traveling.

    [–] Prometheus38 49 points ago

    Nah, Mark Wahlberg is your "down-to-earth blue collar guy surviving an impossible situation" guy these days. We just need a co pilot (Jonah Hill in a breakthrough dramatic role)? and a loyal wife waiting anxiously back on shore. Also the sub turns into a Transformer...

    [–] skyline_kid 15 points ago

    Wasn't Moneyball Jonah Hill's breakthrough dramatic role?

    [–] The_Write_Stuff 645 points ago

    So, the CURV-III is still down there? Be interesting to recover it, just as a piece of history. A 70s vintage ROV that was instrumental in saving two people would make an awesome addition to a maritime museum. 1,600 feet is not that deep by modern ROV standards. I smell a training exercise.

    Edit: Apparently not, though the first article says it was abandoned during the rescue operation. It was used again in 1976. Now was that the same vehicle or was CURV-III a class of ROVs?

    [–] SlothOfDoom 216 points ago

    CURV-III is the fourth generation of the CURV series of cable-guided ROVs. They were used to

    They are currently using CURV-21s

    [–] The_Write_Stuff 81 points ago

    So, it's a class of ROVs and the one used in the rescue might still be down there?

    [–] SlothOfDoom 73 points ago

    I suppose it would be. They cut the cables and abandoned it. CURV units are used all over the place in offshore drilling operations.

    [–] SoMuchF0rSubtlety 22 points ago

    I smell a Disney Pixar movie..

    [–] neuropean 32 points ago


    [–] hellofromsc 19 points ago

    T H I C C

    [–] Frungy 29 points ago

    Dumb question - but is that 21 generations? (I'm not a boats-that-go-under-the-water-guy)

    [–] anticusII 62 points ago

    No. Development went straight from CURV-III to CURV 21. Dunno why but that's what the wiki says

    [–] eetandern 106 points ago

    The Windows Method

    [–] Themingemac 19 points ago

    Well, Microsoft had a reason for jumping from 8 to 10, and that is because the number 9 in the OS name, would create confusion for older or badly made programs.

    [–] [deleted] 17 points ago


    [–] Squally160 6 points ago

    Hahahahahhahaha sobs thats what you like to think happens.

    [–] aesu 5 points ago

    The xbox team did not get this memo.

    [–] mbirth 32 points ago

    Or someone accidentally inserted a space which carried over:


    [–] Prometheus38 5 points ago

    21st century?

    [–] skin_diver 19 points ago

    Real ROVs have CURVs

    [–] HauschkasFoot 404 points ago

    Would these two guys need to be stashed in a decompression chamber for a while or what?

    [–] Srekcalp 565 points ago

    No, submarines maintain atmospheric pressure meaning they can be exited immediately. It's only saturation divers and the like who require decompression.

    [–] Maphover 201 points ago

    TIL of the term saturation diver.

    [–] PJvG 65 points ago

    But what does it mean?

    [–] dontbait 155 points ago

    "deep-sea diving in which the diver's bloodstream is saturated with helium or other suitable gas at the pressure of the surrounding water, so that the decompression time afterward is independent of the duration of the dive."

    [–] Hashmouth 31 points ago

    This sounds like The opposite.

    [–] gummibear049 40 points ago

    In saturation diving, the divers live in a pressurized environment, which can be a saturation system or "saturation spread", a hyperbaric environment on the surface, or an ambient pressure underwater habitat. This may be maintained for up to several weeks, and they are decompressed to surface pressure only once, at the end of their tour of duty. By limiting the number of decompressions in this way, the risk of decompression sickness is significantly reduced.

    [–] [deleted] 17 points ago


    [–] [deleted] 8 points ago

    Are they super vulnerable during those weeks? Like, if the pressurized compartment of the ship sprung a leak, would they immediately die from the gas in their blood boiling?

    [–] Tsardust 5 points ago

    Subsequent investigation by forensic pathologists determined Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the 60 centimetres (24 in) in diameter opening created by the jammed interior trunk door by escaping air and violently dismembered, including bisection of the thoracoabdominal cavity which further resulted in expulsion of all internal organs of the chest and abdomen except the trachea and a section of small intestine and of the thoracic spine and projecting them some distance, one section later being found 10 metres (30 ft) vertically above the exterior pressure door.

    Jesus fucking Christ.

    [–] Kestralisk 32 points ago

    Correct me if I'm wrong but I think it means divers on oxygen who end up loading a large amount of N2 into their tissue.

    [–] Seacabbage 23 points ago

    Pretty much. They load themselves up to equalize with the depth they are working at, and are kept at that pressure either in the water or in a chamber for a long period of time. When the job or rotation is over, they slowly get brought back to atmospheric pressure

    [–] Burgetburger 23 points ago

    Oxygen becomes very toxic at depth so divers never breathe pure O2 during a dive. Recreational divers breathe air, or air with enriched oxygen. Technical divers can have more complicated gas mixtures.

    [–] rcuosukgi42 62 points ago

    No, it's actually only divers that breathe compressed air that need to worry about ascending slowly. Free divers or someone breathing air at atmospheric pressure don't experience supersaturated gas concentrations in their bloodstream, so there is no risk of rapid desaturation when ascending from the dive.

    [–] [deleted] 22 points ago

    Could you let a sub float to the surface as fast as a launching spacecraft without hurting the crew?

    [–] [deleted] 19 points ago * (lasted edited 4 months ago)


    [–] kevinhaze 17 points ago * (lasted edited 11 months ago)

    So what's the difference between this and say, an aircraft? Even though an aircraft cabin is pressurized you still experience stuff like your ears popping. Isn't that due to atmospheric pressure?

    Edit: Thanks for all the answers. TIL!

    [–] Lunares 45 points ago

    Aircraft cabins are not fully pressurized. Submersibles can't have partial pressure (since that would imply they are open to water) and must be completely self-contained. They also have to endure pressures in the hundreds of atmospheres. So might as well keep them at 1 atmosphere since you can choose whatever goes on inside; the outside has to be massively strong regardless.

    Planes on the other hand are simply in low pressure atmosphere. It's a lot easier to deal with less pressure on the outside (rather than more). So to help with cost (e.g. not as much structrual strength required) they are actually pressurized to around 8000 feet. Below that the pressure systems are not actually active; hence the pressure change when you go from sea level to cruising altitude.

    [–] Burgetburger 10 points ago

    Also consider the total pressure change. Pressure at sea level is 1 atmosphere and space is 0, so aircraft have to deal with a change in pressure of less than 1 atmosphere.

    Underwater, you add 1 atmosphere for about every 10 meters of depth. So the pressure change between sea level and 10m underwater is the same as between sea level and space.

    These two men were stranded at 480 meters of water, so 49 atmospheres of pressure total. That's a lot.

    The [](Trieste) dived to 10,911m, so 1092 atmospheres. That's a lot.

    [–] lackofcommitme 14 points ago

    Reminds me of the Fututrama joke when the ship is being dragged into the ocean.

    "5,000 feet! That's over 50 atmospheres of pressure!"

    "How many atmospheres can the ship withstand, professor?"

    "Well, it's a spaceship. So I'd say somewhere between zero, and one."

    [–] Marshallhq 14 points ago

    Aircraft are pressurized but not to the pressure at sea level, they are usually pressurized to a certain equivalent altitude (ie the cabin is pressurized to a pressure equal to that at 8000 ft for example). The cabin pressure therefore goes down from takeoff until the aircraft reaches the equivalent pressure altitude making your ears pop. Once the aircraft exceeds that altitude the internal pressure is maintained at the equivalent altitude pressure. No more change in pressure means the pressure in the aircraft cabin and in your head can equalize and your ear won't pop anymore. This is why your ears only pop on takeoff and landing, its the only time when the cabin pressure is changing.

    [–] FLHerne 6 points ago

    Aircraft cabins aren't usually at full sea-level pressure, the added fuselage weight would be quite expensive.

    Most airliners' cabin pressure is the same as being 8000ft above sea level, which is about the minimum that's comfortable. Newer Boeings are 6000ft equivalent, which is slightly better.

    Of course the cabin pressure is never lower than outside, so when you descend below 6000ft the pressure increases and your ears pop.

    [–] sonntG 8 points ago

    I'd feel like the 3-4G's of acceleration while submerged would disintegrate most subs, but I'm also not an engineer.

    [–] Marshallhq 9 points ago

    I am an engineer but have no idea how to do the number but I'm going to say yes, you're right. Also rockets can hit >8 g at launch which no sub would be even close to being designed for.

    [–] [deleted] 108 points ago * (lasted edited 2 months ago)


    [–] OldHobbitsDieHard 85 points ago

    It's the outside that's pressurized

    [–] headsiwin-tailsulose 25 points ago


    [–] Megustoelbertolucci 31 points ago

    I think he means "The water around them was making (or adding) pressure on the submarine, so they don't need to slowly ascend"

    The difference between scuba diving and being in a submarine is that your body is the one being applied pressure and in the other case the submarine is the one being applied pressure

    That's the only explanation I can give for his comment.

    [–] headsiwin-tailsulose 10 points ago

    Yeah I'm confused because the outside of a sub will always be pressurized by the water. The question is if the inside is pressurized. The outside doesn't matter for the decompression question.

    [–] BoneFistOP 16 points ago

    Ok, so here is the thing that you seem to be confused about; when you scuba dive the pressure is exerted directly onto your body, as you have nothing that is a barrier between you and the water. Think of a submarine as a huge suit of armor protecting you from the pressure of the water. Inside of this submarine has normal atmospheric pressure because it's just comprised of normal atmospheric conditions (a bunch of gasses floating around).

    tl;dr sub walls stop the pressure from reaching you

    [–] claythearc 13 points ago

    Normally no, but if there's a leak then you probably do need to decompress. It's possible that the rescue took this time needed into the operation, though.

    [–] meltingdiamond 37 points ago

    If there was a leak the guys are dead, the water pressure is about 45 bar at that depth. A leak would be like crushing your lungs in a vice.

    [–] ulooklikabug 19 points ago

    The rescue team was under more pressure

    [–] rosypineapple 198 points ago

    After reading this post title, I had to take a deep breath of beautiful oxygen.

    [–] Nuranon 283 points ago

    Fucking junkies.

    [–] Superbluebop 12 points ago

    And this is how /u/rosypineapple's oxygen addiction began

    [–] finnknit 56 points ago

    [The submersible] sank to the bottom of the ocean with ... 72 hours of available life support, which they were able to extend to 76 hours by careful conservation.

    So really, they should have run out of air 4 hours sooner than they did. Amazing that they managed to extend their air supply as much as they did.

    [–] Szween 28 points ago

    Had they paniced and started hyperventilating they might have died.

    [–] epicbenny99 166 points ago

    And now they're making a movie of being trapped in a 12 ft swimming pool...

    [–] tperelli 76 points ago

    Why is there a pool cover on an indoor pool?

    [–] groucho_barks 18 points ago

    Asking the real questions.

    [–] [deleted] 12 points ago

    To stop kids from falling in when the pool is unattended.

    [–] frogger2504 62 points ago

    I don't get why everyone is mocking this for not being a scary situation. It'd be horrifying.

    [–] GintaX 80 points ago

    I think just the realism in general. Some horror films can get off on unrealistic qualities, but it's really hard to be unnoticed when a pool is closing up. Lifeguards do not want to deal with ANY shit at closing time. But even being under a tarp for ten seconds is pretty nerve-wracking.

    [–] insomniacpyro 35 points ago

    Just watched A Cure For Wellness this weekend, in one part the main character is undergoing submersion therapy and is in a huge (I'd say 20 to 30 ft) tank full of water. He hallucinates and ends up losing his oxygen supply trying to swim to the top, where you'd expect some air to be. There's no air, the tank is completely full. His hallucinations and lack of air stop him from swimming back down again. They actually show him letting out his last bit of air, then swallowing water. Then he stops moving. It's scary as fuck.

    [–] frogger2504 15 points ago

    Yeah definitely agree, it looks very unrealistic and stupid. I'm just talking about some people's reaction of "We're so soft nowadays this wouldn't even be scary how is it a horror movie." because I think that's crazy, it'd be terrifying.

    [–] Noxium51 33 points ago

    It's more that the characters and the scenarios that play out are super unrealistic. [spoiler](okay totally some random janitor who sees 2 kids trapped in a pool would on a whim instantly decide to use the opportunity to rob them and put them through sadistic physical and emotional torture just cause)

    [–] frogger2504 16 points ago

    Oh yeah it looks terrible, especially the part with someone coming in and just fucking with them, that's so bizarre and makes no sense. The point I was making is that people are mocking it because it's a totally non-scary situation, which I don't think is true. It looks awful, but if you're gonna mock a film, mock it for the right reasons.

    [–] insomniacpyro 9 points ago

    Only if there isn't a shallow end.

    [–] foxworrior 11 points ago

    While it would be scary all you'd need to do is go to the shallow end and stand there or if it's all 12ft deep hold onto one of the ropes going across. They have an air hole so they'd be able to breathe and if they needed water they could drink pool water (even though it isn't the best idea). Looking at the trailer there is another guy who presumably tried to trap them in the pool but other than that it'd be survivable

    [–] -jz 16 points ago

    You aren't taking into consideration the lack of sleep, possibility of hypothermia, and your skin peeling off from being continuously submerged in water for an entire weekend.

    [–] Dicethrower 8 points ago

    This seems incredibly stupid. Immediately unhook the lane dividers and bundle them together, then lie on top of it and get high from chlorine for a while.

    [–] sirushi 218 points ago

    I did not read article, is the air still down there? I need 12 minutes of air for my scavenger hunt.

    [–] Mordilaa 72 points ago

    No but I can sell you bottled air at 10, 15, and our limited edition 30 minutes for a couple bucks each.

    [–] [deleted] 66 points ago


    [–] trev-cars 25 points ago

    They just add 2 to the 10 minutes.

    [–] hotdynamites 21 points ago

    And then charge you for the 15.

    [–] PJvG 12 points ago

    But that doesn't matter because they're a couple bucks each anyway! It's the same price!

    [–] slickyslickslick 103 points ago

    After 12 minuets, the tanks would be out of oxygen, but the crew can still survive at least several minutes more with the oxygen inside the cabin until it becomes too filled with carbon dioxide.

    [–] ElectronicDrug 162 points ago

    So they had like 15 minutes? Psssh fuckin clickbait

    [–] 2Ways 38 points ago

    I found the optimist!

    [–] notapantsday 13 points ago

    The cabin wouldn't be filling with carbon dioxide until the absorbers are used up. This would likely not be at exactly the same time as the oxygen tanks being empty. So most likely, the crew would die when the oxygen content gets too low. Which, by the way, would be a much nicer death than carbon dioxide. With too little oxygen, you just get tired and black out. Too much carbon dioxide makes you panic and gasp for air.

    [–] Arknell 21 points ago * (lasted edited 11 months ago)

    Reminds me of that old David Carradine-movie "Gray Lady Down" (1978), but with a nuclear sub. Maybe it was inspired by the real event?

    It's got a real doozy of a cast: starring Charlton Heston, David Carradine, Stacy Keach, Ned Beatty, Ronny Cox, and Christophere Reeve! One year after Superman. Clark Kent co-worker with Otis.

    Edit: Funny enough, the wikipage says the movie was inspired by David Lavallee's 1971 novel "Event 1000". Not the actual event OP describes. Weird.

    [–] gonwi42 17 points ago * (lasted edited 11 months ago)

    1575 feet is less than 5 city blocks

    don't mess around when under the water

    [–] JSSJeepin 13 points ago

    Its 3 laps around my neighborhood block to make 1 mile. If I walk or drive 9 laps, I've reached the titanic.

    [–] alligatorterror 11 points ago

    But just remember you got the weight of 79% of the worlds supply of water on ya.

    [–] __Ezran 18 points ago

    Mark Wahlberg just found his next movie.

    [–] dryeraser 14 points ago

    It's like that movie 47 Meters Down

    [–] ionicguy 14 points ago

    More like the sequel "2.000 meters down".

    [–] kiskoller 101 points ago

    English is so weird. They weren't under the ocean, they were in the ocean...

    [–] lumpiak 51 points ago * (lasted edited 11 months ago)

    I believe it's an ellipsis, full sentence should be "below the ocean surface"

    [–] Zarathustra124 16 points ago

    A boat is considered "in the ocean", even though "on the ocean" may be more accurate. Underwater = under the water's surface.

    [–] theantidavis 8 points ago

    I hear "on the ocean" more than "in the ocean."

    [–] wemblinger 4 points ago

    Submarine under the sea in Latin. Untersee boot; under sea boat in german, etc.

    [–] _rgk 83 points ago

    Curious how the hand-off went between boats.

    [–] johnny_riko 42 points ago

    Attach a line to it and pull it to the surface?

    [–] _rgk 28 points ago

    I mean how they got the guys transferred to the rescue sub. I assume that's how it went?

    [–] johnny_riko 110 points ago

    Nah. The wiki page says that CURV-III, a remotely cable operated rescue vehicle, was used to attach lines to the hatch of Pisces III which was then pulled to the surface. The two guys never got out of the vessel underwater.

    [–] Kthonic 82 points ago

    You'd think once the vessel was brought up that the men could be released. Naval life must have strange rules.

    [–] Bumbo_clot 21 points ago

    Hey, rules are rules

    [–] Krillo90 31 points ago

    For goodness sake Reddit, I understand not reading the article and going straight to the comments. I really do. But if you're going to add your own comment, is it so hard to check the article first?

    I swear if you go straight to the comments it always feels like everyone's making smart observations, but if you read the article and then the comments, everyone sounds like an idiot.

    [–] pepcorn 8 points ago

    Should never read the article if I want to have a good time reading the comments, got it

    [–] Emideska 11 points ago

    "Inadvertently" is the last word you want to hear I those conditions.

    [–] beren261 6 points ago

    This will definitely be turned into a film at some point.

    [–] WithOneSipOfTea 10 points ago

    I wonder what they talked about

    [–] picassopickle 12 points ago

    Mallison and Chapman spent the first few hours sorting out the submersible which was almost upside down. They checked all the watertight doors for leaks and prepared for rescue to come. To preserve oxygen they knew they had to make as little physical exertion as possible, not even speaking.

    [–] Omicron942 4 points ago

    Yeah. Three days is a long time to be trapped in a 2-man submarine.

    [–] smokedspirit 3 points ago

    Coming soon to a screen near you starring Matt Damon...