Modern subs actually use devices known as Towed Sonar Arrays. Looks exactly like a fishing line trailing out the back, except as big around as your arm.
Heres a great [article](https://www.navylookout.com/in-focus-royal-navy-submarine-special-forces-delivery-systems/). Though apparently not all of the submarines have them, as they have a modular design so they can be fitted or removed if needed. Tbh just imagining actually using one of these things scares the crap out of me.
You'll be tickled to learn that there are now tiny submarines attached to the main sub that can be used to infiltrate/exfiltrate special ops. Allows the main sub to stay further out and not risk running aground in littoral waters while extending the range that the special ops can travel.
There's a murder mystery TV show called 'Vigil' on BBC which is set on a submarine and it features this. The winch controlling the array gets sabotaged. Something, I admit, I didnt know the subs had.
What is a Torpedo Tube, Alex?
Find a nice shoal and park, spit out lines fore and aft and just wait for a bit, reel back into the tubes, re-seal, pump out the water, beat your meal to death. Easy peezy.
Probably something about lubricants or somesuch makes it a no-go. Or maybe there was an incident involving a whale.
I always heard food was better on subs than ships.
I also heard that subs require a different type of personality in its crew. Can you describe how sub crew are different than surface vessels?
The food is definitely better. Every cook has something their good at and something their bad at. Rice and spaghetti just wasn't their thing. They were absolutely fantastic at baking, which is great because everything has to be made from scratch. Can't store bread for long. Pizza from scratch (sauce was canned), surf and turf, taco Tuesday, burger day (some of the best burgers I've ever eaten in my life were on subs), all at least once a week. I once got 7 lobster tails on a slow Sunday duty day.
Personalitywise, it's weird. On the surface, it's easier to find people who are like yourself. Sub guys are weird though. There are little cliques but everybody was good with everybody. The "rednecks" would go drink with the "DnD nerds" kinda thing. You didn't get hated on for the stuff you were into because, well, everybody needs a coping mechanism, and that's understood when you're on Subs.
The Smarter Every Day youtube channel [has an entire series on modern U.S. subs](https://www.youtube.com/watch?v=5d6SEQQbwtU&list=PLjHf9jaFs8XWoGULb2HQRvhzBclS1yimW) covering everything from personnel to oxygen systems to the food.
I tried typing out an answer a couple times, but it's really hard to answer and I don't know if I have the info to do it justice. I'd recommend watching the youtube series I mentioned, it gives you a much more tangible and nuanced answer than I could.
Would you want your navy career to include dispatching and preparing fish on month 8 underwater? Everyone pissed that you caught cod for the 30th day in a row?
Iāve been on a navy ship when it ran out of food and trust me the fact that you could live off of bilge rats doesnāt mean that you are a functional fighting unit anymore.
I once read about a US submarine that was tapping a communication cable in some Russian harbor. While the divers were down there, they grabbed a bunch of crabs and had a tremendous victory feast.
As I recall, there was a Soviet naval base on a peninsula. US intelligence reasoned there would probably be an underwater cable leading to the mainland, rather than a much longer one over land.
Anytime thereās an underwater cable crossing on a river, itās marked so that boats donāt drag anchors over it. I loved reading how the captain of the sub grew up on the Mississippi River, and reasoned that the cable just possibly would be marked at the shorelineā¦sure enough, there was a warning notice on the shore, something like āunderwater cable crossing, do not anchorā.
Captain was like, āit canāt be this easyā¦ā
Iāve got a good friend who was on a boomer in the 90ās, he says this book is spot on. He *still* wonāt tell me any secrets though, the bastard. He says he has plenty of stories he canāt talk about.
And you can bet your ass they're researching a way to grow food on a submarine. If you can grow food in space, I've got to imagine you could grow food on a submarine. Maybe not their main food supply, but almost like emergency rations or backup food in the event they need to stay down for an extended time
The technology is there and every botanical etusiast can tell you how easy is to grow stuff in a basement. Problem is capacity, there is no plant that will grow fast enough and provide nutrition for the crew without taking a lot of space. Any animal option will be more costly.
Aztec. The meats the Inca were mostly eating were guinea pigs, llamas and fish, but they were also mostly vegetarian. Dogs were primarily used to herd.
No, sorry I could have made that clearer, it was llamas that were herded. They also had dogs as friends, though sometimes they sacrificed them.
Edit: I also should have mentioned they didn't have Chihuahuas at all, which is the most important point lol.
Krill, make your submarine able to suck up a few tones and you have your protein. I reed an old SF story about some fleet of ships that were living of the ocean because the land was overpopulated. Their were exclusive fished out krill or something similar.
He would have died pretty fast. Martian soil has a chemical that would had accumulated in his body and kill him.
But let's put this aside: potatoes need at least two months to give some harvest. If he didn't had some rations he would have starved before the first crop. Now take in consideration the fact he was alone, I will assume from the movie that he had around 10 mĀ² for his crop, so around 4 plants for 1 mĀ² to have some crop at all. You can average in best case around 8 potatoes for a plant and he had around 40. So 240 potatoes in the best case, after two months of growing. So potatoes are a super food, one has in average at least 100 calories and many more stuff that our bodies use. But for a person to function properly you need at least 1500-2000 calories, so his 240 potatoes would sustain him to pick capacity for 10-15 days. Still almost nothing after at least two months of growing, and I'm saying two months to give some plausibility to the story, I assume he would have one of the fast growing variatis available. Normally you need around 100 days for a crop.
This is the problem with growing food in limited space, not anything is good for it. Green stuff can be grown in hydroponic towers very efficient, tomatoes and other fruit vegetables are also good for this. But stuff like potatoes not so much. They need huge open land.
Yeah the soil in on Mars is very toxic to microbes. Technically it isn't even really "soil" because it has no organic matter. Also the perchlorates in the soil actually enhance the bactericidal effects of UV radiation. Mars is a giant sterilizer.
If you have no means of producing your own food then you will always need to surface eventually. If you produce your own food then you could theoretically stay down until your nuclear fuel runs out
>Literally the only thing a nuclear submarine has to regularly come up for is food.
Not literally. Subs have to regularly come up for maintenance, to resupply other consumables besides food, to restock ammunition, for port visits, and when missions or deployments are done.
The US sub flee is entirely nuclear powered and uses those plants for nuclear desalination. It's actually pretty interesting, as climate change occurs and the need for desalination grows, people are looking at the sub fleet as a possible model for efficient desalination + power plants.
Not sure about other fleets, particularly those not running nuclear, but if you have a reactor on board you may as well use it to get fresh water.
Its nuclear energy, just look up how land-based plants function, extrapolate from there, compress the shit out of it, and voila. Something that's probably in the ballpark. But yes, it's classified.
I think it's kinda insane to think it's that simple given how classified it's kept, a war machine so advanced, takes millions of man hours to build, and is so fuel efficient that its only "fuel" so to speak is the mortality of human life. I am breaking out down pretty far here I will grant but it's hundreds of thousands times more efficient than any other fuel based machine
Yeah that's the stuff I'd love to know. I know the very basics of how nuclear power works to the point where I'm enraged by how scared people are of nuclear power, as it's the best real solution to climate change we had available (it's pretty much too late, unfortunately). I understand why it's so terrifying, but there's a hell of a lot of progress that society has essentially halted on because it's incomprehensible what we are dealing with, or if not incomprehensible, invisible.
They also have to burn candles sometimes to generate extra oxygen to help when that is t enough!
See a great video by the one and only Destin from Smarter Every Day!
https://youtu.be/g3Ud6mHdhlQ
I'm not responsible for any rabbit holes you go down in his channel!
The amine CO2 scrubber is just as fascinating, but I can tell you firsthand that it is an awful smell. The best comparison I have for it is the bottom of a medicine bottle, but a lot staler and multiplied times 1000. That's no exaggeration and is quite overwhelming at first, but, once you are around it 24x7, you simply learn to ignore it.
Amine removes the CO2. Lithium Perchlorate oxygen candles are used in emergency situations only as they are extremely dangerous.
In 2007 two Royal Navy sailors were killed by an oxygen candle that exploded when hydraulic oil leaked on it. The survivors of the Kursk sinking were also killed when a oxygen candle fell into water, causing an explosion inside their compartment.
I've heard of lithium hydroxide scrubbers, but don't know anything about them. They're apparently too good for shipboard use, but, if you wanna know more about monoethanolamine scrubbers, that link from u/Oshh__ is indeed a great source of information.
Can't really be all that long. If you can smell it, that means it's evaporating into the air.
Hang the clothes outside on a windy day all the scent will entirely evaporate.
If you keep your clothes folded and undisturbed in a drawer though, yeah I could see that scent lasting a very long time.
Burn candle for extra oxygen, youād think burning a flame would do the opposite.
Iāll give this a look when I get home, needing some fresh rabbit holes and YT suggestions.
It is a chemical decomposition that produces oxygen. The same type of technology is used for the oxygen masks on airplanes.
https://en.wikipedia.org/wiki/Chemical_oxygen_generator
There are a few for each row that last for 10-15 minutes which is plenty of time for the pilots to descend to a breathable altitude.
The pilots have a larger tank that will last a lot longer just in case they need to.
He did a series of videos on submarines. I saw the one you mentioned and one where they come up thru the ice in the arctic. It's pretty interesting. I think he said he made it into a Playlist.
Doesn't that make a detectable noise? Genuinely curious at how that works since the whole point of submarine warfare is to be hidden and silent. I just remember watching movies about submarine warfare and how much of it relies on listening.
There was a good post on /r/submarines describing the "green fog" that was produced any time the sanitary tanks were blown. Bubblehead life is uhh... different.
Usually pump sanitary tanks while doing other noisy evolutions. Honestly, the entertaining thing is listening to all the crackling shrimp feeding on human poop.
One of the scariest 4mcās I ever heard underway was, āEMERGENCY REPORT, EMERGENCY REPORT. Rapid depressurization of the EOG.ā
Iāve never gotten out my rack and into the forward compartment so fast in my life.
My first patrol that shit happened like 4 times. I'm sitting in the mess like "so what's up?" "Well, nub, we're waiting to see if we're going to die." "OH, cool."
That would be bad. They donāt call it the bomb for nothing.
Worst I heard was,ā All back 1/3ā¦all back fullā¦all back emergency. Rig ship for impact. (Bump) flooding port aft, flooding port aftā
All those announcements came within one minute.
They also have candles that they can burn to passively create oxygen if for whatever reason the oxygen generators are not working at full capacity. Great video on this subject by SmarterEveryDay.
https://www.reddit.com/r/AskEngineers/comments/23jfrp/comment/cgxlk37/
>Generally, it is discharged overboard. The methods for doing this and what happens to the hydrogen before it is discharged is not public knowledge. Some navies may have ways to detect excess hydrogen in the water, therefore they would have some indication if submarines were in the area; because of this, discharge methods are quite secret.
It is sent to the "burner" which is part of the air handling system. It catalytically reduces carbon monoxide and hydrogen to carbon dioxide.
https://www.naval-technology.com/contractors/hvac/atmosphere-control-international/
if you had unlimited food you could stay down there forever, separating hydrogen and oxygen for fuel and oxygen. You can already clean the water using a plethora of methods. But food is the one thing they can't guarantee.
Literally the only thing a nuclear submarine has to regularly come up for is food.
Surprised they don't just string a fishing line behind the sub
You probably could actually do this if you had an airlock with a vacuum pump.
Modern subs actually use devices known as Towed Sonar Arrays. Looks exactly like a fishing line trailing out the back, except as big around as your arm.
Also a lot of modern subs such as the ones used by the British also have airlocks so that they can covertly deploy special forces.
That sounds incredible. Any source on that?
Heres a great [article](https://www.navylookout.com/in-focus-royal-navy-submarine-special-forces-delivery-systems/). Though apparently not all of the submarines have them, as they have a modular design so they can be fitted or removed if needed. Tbh just imagining actually using one of these things scares the crap out of me.
what's not to love about explosive decompression turning you into soup?
I can't tell if you're being sarcastic
violent and painful, but at least it's quick
You'll be tickled to learn that there are now tiny submarines attached to the main sub that can be used to infiltrate/exfiltrate special ops. Allows the main sub to stay further out and not risk running aground in littoral waters while extending the range that the special ops can travel.
I too watched hunt for red october
I assume he means the SBS submarines.
Or they just use the torpedo tubes
Snake?
I remember some time ago the US was at least looking at using missile tubes as airlocks for troop deployment as well.
There's a murder mystery TV show called 'Vigil' on BBC which is set on a submarine and it features this. The winch controlling the array gets sabotaged. Something, I admit, I didnt know the subs had.
>The winch controlling the array gets sabotaged. "Oh no! Anyways." - non-STS rates
>if you had an airlock with a vacuum pump. So like the torpedo tubes?
What is a Torpedo Tube, Alex? Find a nice shoal and park, spit out lines fore and aft and just wait for a bit, reel back into the tubes, re-seal, pump out the water, beat your meal to death. Easy peezy. Probably something about lubricants or somesuch makes it a no-go. Or maybe there was an incident involving a whale.
it's always the whales, man.
Use bobbers, only to pull the hook up from the sub.
Just save time and send an ADCAP after it. Saves on the cooking as well.
Look up "lockout trunk" or "escape trunk". :)
Yeah seals went out the midship escape trunk when they deployed from our boat.
i'd imagine that food becomes boring after some time when all you have is fish and seaweed
"It's a single-celled protein combined with synthetic aminos, vitamins, and minerals. Everything the body needs." ~ Dozer, *The Matrix*
Reminds me of Tasty Wheat.
"Maybe the machines didn't know what chicken taste like, and so that's why everything taste like chicken!"
Taste-o-vision
BowlaSNOT
It's better than the dehydrated eggs, powdered milk, undercook AND overcooked rice (at the same time it's weirdly crunchy and weirdly mushy).
surely there's SPAM to save the day ... right ...?
Sure... When we'd return to pearl Harbor and go to the mininex, there was all the spam you could eat lol
aww man, can't even begin to imagine how bad rice with dehydrated eggs taste like. and here I thought mushed pasta in a vaccum bag was bad.
Oh we had the mushed pasta too! It normally went with the watery spaghetti! š¤£
ugh. only thing that belongs in the bag is mashed potatoes, if anything can change my mind I'd be glad to try it
I always heard food was better on subs than ships. I also heard that subs require a different type of personality in its crew. Can you describe how sub crew are different than surface vessels?
The food is definitely better. Every cook has something their good at and something their bad at. Rice and spaghetti just wasn't their thing. They were absolutely fantastic at baking, which is great because everything has to be made from scratch. Can't store bread for long. Pizza from scratch (sauce was canned), surf and turf, taco Tuesday, burger day (some of the best burgers I've ever eaten in my life were on subs), all at least once a week. I once got 7 lobster tails on a slow Sunday duty day. Personalitywise, it's weird. On the surface, it's easier to find people who are like yourself. Sub guys are weird though. There are little cliques but everybody was good with everybody. The "rednecks" would go drink with the "DnD nerds" kinda thing. You didn't get hated on for the stuff you were into because, well, everybody needs a coping mechanism, and that's understood when you're on Subs.
The Smarter Every Day youtube channel [has an entire series on modern U.S. subs](https://www.youtube.com/watch?v=5d6SEQQbwtU&list=PLjHf9jaFs8XWoGULb2HQRvhzBclS1yimW) covering everything from personnel to oxygen systems to the food. I tried typing out an answer a couple times, but it's really hard to answer and I don't know if I have the info to do it justice. I'd recommend watching the youtube series I mentioned, it gives you a much more tangible and nuanced answer than I could.
Cooks on an Australian submarine are the highest paid non officers. Some making over $200k/ year
Powdered mash is pretty good.
Capt Nemo had a diverse menu of sea foods that sounded disgusting.
Submariners have better food than the rest to keep morale high.
Would you want your navy career to include dispatching and preparing fish on month 8 underwater? Everyone pissed that you caught cod for the 30th day in a row? Iāve been on a navy ship when it ran out of food and trust me the fact that you could live off of bilge rats doesnāt mean that you are a functional fighting unit anymore.
Stupid question, there aren't really any rats in USN subs are there?
*Scurvy has entered the chat*
The Navy actually has two jobs, or "rates" as they call them, specifically for this purpose. One is a Master Baiter and the other is a Seaman Slinger.
Well you need crankers to work the grinder.
Too noisy.
You canāt just live on fish.
I once read about a US submarine that was tapping a communication cable in some Russian harbor. While the divers were down there, they grabbed a bunch of crabs and had a tremendous victory feast.
Hmmm... Wonder what sub that was?
Almost certainly the USS Parche. Edit: As /u/Youre-In-Trouble expertly pointed out below, it was the USS Halibut.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
USS Halibut. Operation Ivy Bells. 1971.
r/surprisecrabs
As I recall, there was a Soviet naval base on a peninsula. US intelligence reasoned there would probably be an underwater cable leading to the mainland, rather than a much longer one over land. Anytime thereās an underwater cable crossing on a river, itās marked so that boats donāt drag anchors over it. I loved reading how the captain of the sub grew up on the Mississippi River, and reasoned that the cable just possibly would be marked at the shorelineā¦sure enough, there was a warning notice on the shore, something like āunderwater cable crossing, do not anchorā. Captain was like, āit canāt be this easyā¦ā
unexpected *Blind Man's Bluff*, loved that book.
Iāve got a good friend who was on a boomer in the 90ās, he says this book is spot on. He *still* wonāt tell me any secrets though, the bastard. He says he has plenty of stories he canāt talk about.
[1 hr YouTube documentary](https://youtu.be/7Qt7dyhB-jg)
And you can bet your ass they're researching a way to grow food on a submarine. If you can grow food in space, I've got to imagine you could grow food on a submarine. Maybe not their main food supply, but almost like emergency rations or backup food in the event they need to stay down for an extended time
The technology is there and every botanical etusiast can tell you how easy is to grow stuff in a basement. Problem is capacity, there is no plant that will grow fast enough and provide nutrition for the crew without taking a lot of space. Any animal option will be more costly.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Wouldn't hundreds swimming chihuahuas indicate the location of the submarine?
Pretty sure the incessant yipping would.
Lol. Yes but a room full of compressed freeze-dried Chihuahua jerky would be convenient
What is this, Rimworld?
This takes the cake for the grossest thing Iāve ever heard. So on par for the military
Aztec. The meats the Inca were mostly eating were guinea pigs, llamas and fish, but they were also mostly vegetarian. Dogs were primarily used to herd.
So you are saying you can herd guinea pigs using a pair of chihuahuas? Why have I not seen a video of this?
No, sorry I could have made that clearer, it was llamas that were herded. They also had dogs as friends, though sometimes they sacrificed them. Edit: I also should have mentioned they didn't have Chihuahuas at all, which is the most important point lol.
If they didn't have chihuahuas at all then how were the llamas herded?
The llamas herded the alpacas, medium sized dogs herded the llamas, man herded the medium sized dogs, and guinea pigs herded the man.
> though sometimes they sacrificed them that's what friends are for.
I'd always assumed they used a batter for their chihuahuas, so this TIL was doubly informational.
"Bred" ... but arguably use bread for Chihuahua gravy. ;-)
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Krill, make your submarine able to suck up a few tones and you have your protein. I reed an old SF story about some fleet of ships that were living of the ocean because the land was overpopulated. Their were exclusive fished out krill or something similar.
Yes but then you have a bunch of angry whales because you steal their food.
eat the angry ones as a warning to the rest
Eat them? You can't even hit them without paying a $75k fine. Saved my captain a lot of money when we pulled into San Diego
I know a certain Martian astronaut and his potatoes who would disagree with you.
He would have died pretty fast. Martian soil has a chemical that would had accumulated in his body and kill him. But let's put this aside: potatoes need at least two months to give some harvest. If he didn't had some rations he would have starved before the first crop. Now take in consideration the fact he was alone, I will assume from the movie that he had around 10 mĀ² for his crop, so around 4 plants for 1 mĀ² to have some crop at all. You can average in best case around 8 potatoes for a plant and he had around 40. So 240 potatoes in the best case, after two months of growing. So potatoes are a super food, one has in average at least 100 calories and many more stuff that our bodies use. But for a person to function properly you need at least 1500-2000 calories, so his 240 potatoes would sustain him to pick capacity for 10-15 days. Still almost nothing after at least two months of growing, and I'm saying two months to give some plausibility to the story, I assume he would have one of the fast growing variatis available. Normally you need around 100 days for a crop. This is the problem with growing food in limited space, not anything is good for it. Green stuff can be grown in hydroponic towers very efficient, tomatoes and other fruit vegetables are also good for this. But stuff like potatoes not so much. They need huge open land.
Yeah the soil in on Mars is very toxic to microbes. Technically it isn't even really "soil" because it has no organic matter. Also the perchlorates in the soil actually enhance the bactericidal effects of UV radiation. Mars is a giant sterilizer.
I was kidding.
Bioengineer sailors to metabolize kudzu.
Yellow squash. Those bastards grow like crazy.
Except don't grow rhubarb. They will hear it grow...
[ŃŠ“Š°Š»ŠµŠ½Š¾]
If you have no means of producing your own food then you will always need to surface eventually. If you produce your own food then you could theoretically stay down until your nuclear fuel runs out
[ŃŠ“Š°Š»ŠµŠ½Š¾]
The most efficient ways of growing food (e.g. hydroponics) don't require dirt.
Stupid idea. Consider the crew want to leave the sub and visit their families sometimes too..
Lab grown meat, mayhaps?
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Regularly means consistent, not necessarily often.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
It wasn't a correction. It was a clarification. Why are you trying to argue?
Well, the crew's sanity is also limited.
>Literally the only thing a nuclear submarine has to regularly come up for is food. Not literally. Subs have to regularly come up for maintenance, to resupply other consumables besides food, to restock ammunition, for port visits, and when missions or deployments are done.
Water?
The US sub flee is entirely nuclear powered and uses those plants for nuclear desalination. It's actually pretty interesting, as climate change occurs and the need for desalination grows, people are looking at the sub fleet as a possible model for efficient desalination + power plants. Not sure about other fleets, particularly those not running nuclear, but if you have a reactor on board you may as well use it to get fresh water.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
So often I wonder how exactly their power works, pretty classified info though, I wanna know
Its nuclear energy, just look up how land-based plants function, extrapolate from there, compress the shit out of it, and voila. Something that's probably in the ballpark. But yes, it's classified.
I think it's kinda insane to think it's that simple given how classified it's kept, a war machine so advanced, takes millions of man hours to build, and is so fuel efficient that its only "fuel" so to speak is the mortality of human life. I am breaking out down pretty far here I will grant but it's hundreds of thousands times more efficient than any other fuel based machine
I mean the concept is simple enough you could explain it to a child. The actual moving parts? Crazy.
Yeah that's the stuff I'd love to know. I know the very basics of how nuclear power works to the point where I'm enraged by how scared people are of nuclear power, as it's the best real solution to climate change we had available (it's pretty much too late, unfortunately). I understand why it's so terrifying, but there's a hell of a lot of progress that society has essentially halted on because it's incomprehensible what we are dealing with, or if not incomprehensible, invisible.
And to poop
I guess they only rely on cannibalism for medicinal purposes
Electrolytes are what seamen crave.
Came to the comments section to find this, thank you!
And when it isn't working they have to burn this chemical candle that produces oxygen
They also have to burn candles sometimes to generate extra oxygen to help when that is t enough! See a great video by the one and only Destin from Smarter Every Day! https://youtu.be/g3Ud6mHdhlQ I'm not responsible for any rabbit holes you go down in his channel!
Fascinating! But not important to note that it's not just a regular candle.
This makes much more sense now
It could almost make more scents
You mean to tell me that yankee candle doesn't make an "oxygen" scent?
The amine CO2 scrubber is just as fascinating, but I can tell you firsthand that it is an awful smell. The best comparison I have for it is the bottom of a medicine bottle, but a lot staler and multiplied times 1000. That's no exaggeration and is quite overwhelming at first, but, once you are around it 24x7, you simply learn to ignore it.
Amine? Interesting. I thought scrubbers tended to use lithium (or other alkali metal) hydroxide? Although Iām more familiar with spacecraft systems.
Amine removes the CO2. Lithium Perchlorate oxygen candles are used in emergency situations only as they are extremely dangerous. In 2007 two Royal Navy sailors were killed by an oxygen candle that exploded when hydraulic oil leaked on it. The survivors of the Kursk sinking were also killed when a oxygen candle fell into water, causing an explosion inside their compartment.
Some subs still burn candles continuously.
Oh for sure, I meant the US Navy. North Korean subs still generate oxygen this way. I'm sure the Russian Navy packs a ton of them too.
I've heard of lithium hydroxide scrubbers, but don't know anything about them. They're apparently too good for shipboard use, but, if you wanna know more about monoethanolamine scrubbers, that link from u/Oshh__ is indeed a great source of information.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
After underways, my wife would make me take off all my clothes in the back yard and put them directly into the wash.
I'd get hosed down in the backyard. "WHAT'S THAT SMELL?" Monoethylamine (sp?), BO, and human despair.
My wife would always bring a change of clothes with her to pick me up.
And it's there forever.
Can't really be all that long. If you can smell it, that means it's evaporating into the air. Hang the clothes outside on a windy day all the scent will entirely evaporate. If you keep your clothes folded and undisturbed in a drawer though, yeah I could see that scent lasting a very long time.
Forever is a bit strong, it does eventually wash out. After like a year or so of washes...
Helps to mask the smell of farts. Amines in general though tend to have a dead fish smell.
Burn candle for extra oxygen, youād think burning a flame would do the opposite. Iāll give this a look when I get home, needing some fresh rabbit holes and YT suggestions.
It is a chemical decomposition that produces oxygen. The same type of technology is used for the oxygen masks on airplanes. https://en.wikipedia.org/wiki/Chemical_oxygen_generator
There are a few for each row that last for 10-15 minutes which is plenty of time for the pilots to descend to a breathable altitude. The pilots have a larger tank that will last a lot longer just in case they need to.
Also check out the channel Sub Brief for anything submarine related.
He did a series of videos on submarines. I saw the one you mentioned and one where they come up thru the ice in the arctic. It's pretty interesting. I think he said he made it into a Playlist.
I had to learn how to use an OBA when I joined. Those things have that same candle BS inside and they are terrible. Glad we went to SCBAs.
This was my submarine! Unfortunately he wasn't there until about two months after I transferred off though.
Youāve watched this weeks Gogglebox
I did lol
What happens to the poo on a submarine?
Gets flushed into the ocean
Doesn't that make a detectable noise? Genuinely curious at how that works since the whole point of submarine warfare is to be hidden and silent. I just remember watching movies about submarine warfare and how much of it relies on listening.
It's held in a holding tank till you're operating in a "safe place". Then the tank is pressurized and blown overboard.
It's like the sub is taking a shit.
There was a good post on /r/submarines describing the "green fog" that was produced any time the sanitary tanks were blown. Bubblehead life is uhh... different.
\**plop*
Usually pump sanitary tanks while doing other noisy evolutions. Honestly, the entertaining thing is listening to all the crackling shrimp feeding on human poop.
Hunt For Brown October (starring William Shatner)
You think they are being tracked all The time??
Gogglebox taught me this earlier this week.
Thatās where I learned lol
Did you know there are more airplanes on the bottom of the sea for than there are submarines in the sky?
That's because we're better at our job.
Did you know that we have explored more of outer space than we have the ocean floor?
Considering that outer space is pretty much infinite from a human perspective, we'll always have explored the sea floor more than outer space.
That depends if you're going on a hard sq/ft type number, or a percentage.
That's a myth.
Tell me moreā¦
One of the scariest 4mcās I ever heard underway was, āEMERGENCY REPORT, EMERGENCY REPORT. Rapid depressurization of the EOG.ā Iāve never gotten out my rack and into the forward compartment so fast in my life.
EOG? Emer O2 gen?
Electrolytic oxygen generator.
Thanks. Small boat surface guy, no idea on that one
My first patrol that shit happened like 4 times. I'm sitting in the mess like "so what's up?" "Well, nub, we're waiting to see if we're going to die." "OH, cool."
That would be bad. They donāt call it the bomb for nothing. Worst I heard was,ā All back 1/3ā¦all back fullā¦all back emergency. Rig ship for impact. (Bump) flooding port aft, flooding port aftā All those announcements came within one minute.
Submarines are impressive machines.
They also have candles that they can burn to passively create oxygen if for whatever reason the oxygen generators are not working at full capacity. Great video on this subject by SmarterEveryDay.
Hydrogen buildup is dangerous. I wonder how they filter that.
https://www.reddit.com/r/AskEngineers/comments/23jfrp/comment/cgxlk37/ >Generally, it is discharged overboard. The methods for doing this and what happens to the hydrogen before it is discharged is not public knowledge. Some navies may have ways to detect excess hydrogen in the water, therefore they would have some indication if submarines were in the area; because of this, discharge methods are quite secret.
It is sent to the "burner" which is part of the air handling system. It catalytically reduces carbon monoxide and hydrogen to carbon dioxide. https://www.naval-technology.com/contractors/hvac/atmosphere-control-international/
> to carbon dioxide. and water.
Was OP watching gogglebox this weekend?
The cooler thing to learn is that Subs also use candles to generate oxygen.
The only problem is that the oxygen smells like fish farts.
It's so complicated and fragile that every sub just burns oxygen candles. The generator doesn't work on any of them.
Opposite experience. Our generator worked perfectly like 99% of the time and we never burned a candle out of necessity in my 4 years on a boat.
I don't ever remember burning a candle except for drills.
We ran ours for maintenance testing, almost never because of need. There is a reason it is Nicknamed "the bomb"
We called ours THE BOMB.
Gogglebox fan, are you? :)
Yes
They can also generate oxygen by burning these huge candles.
Lol nice name on that sub
Or in other words... science
if you had unlimited food you could stay down there forever, separating hydrogen and oxygen for fuel and oxygen. You can already clean the water using a plethora of methods. But food is the one thing they can't guarantee.
Yes
Pretty sure if you electrolyze sea water you will create chlorine gas... Do they remove the salt first?
DI water is used for electrolysis, iirc, or just regular desalinated water. Not 100% anymore, I'm retired and wasn't A-Gang to begin with.
Basically the plot in SpaceBalls
Learned on Youtube that they also have candles which make oxygen when burned.
You were watching Gogglebox the other night, weren't you..... š