Why did the submarine U 120 sink when the toilet broke down? Please elaborate.

Those are all rumors, and there is another saying that the captain forgot to close the window when he smoked. These are all rumors.

A German submarine (U- 1206) sank due to a mistake in flushing the toilet. At that time, the submarine was forced to float because of a large amount of water, and suddenly it was attacked by allied planes on the sea and was sunk. However, because the incident was very close to the coast at that time, all the people on board were rescued because of the rapid evacuation.

I'll give you some information I found for your reference:

Many people may not have entered the bridge of the submarine, and there is a small corner in the upper and lower transparent shell that is the toilet. The old submarine toilet is a dry toilet without flushing. After one person comes up to defecate, another person continues to pile on this dunghill ... The dunghill slowly piles up and emits hot air. In winter in the North Sea, the cold wind is blowing, and my ass is freezing. Even so, some people are willing to defecate on the bridge ... because the underwater toilet in the submarine is too complicated to operate. Flushing toilets is more difficult and dangerous, and improper disposal may cause serious consequences of seawater intrusion. According to the available information, at least one German submarine (U- 1206) was sunk because of a mistake in flushing the toilet. At that time, the submarine was forced to float because of a large amount of water, and suddenly it was attacked by allied planes on the sea and was sunk. However, because the incident was very close to the coast at that time, all the people on board were rescued because of the rapid evacuation. It is conceivable that other submarines have similar experiences.

The hapless director Zhang Lao experienced it personally. 1979 or so, he personally went to sea to guide medical security, and the captain was very enthusiastic and gave him the lounge. Then, before going to the toilet, the military doctor who led the way repeatedly confessed that the director Zhang Lao knew everything and understood it very well ... As a result, there was a blowout accident in the toilet, and the whole toilet was everywhere ... The director Zhang Lao was the star of the moon! After the two crew members asked for instructions, they helped him "wipe" the bath with precious water ... It was terrible ... Since then, Director Zhang has never had the courage to board the ship, and jokes have spread all over the base. However, director Zhang Lao is a careful person and instructed the military doctor on the submarine to bring two kinds: sweet potato and glycerin suppository, both of which are laxatives. Sweet potato cooked orally, glycerin embolism * * (you don't upside down! )

Why is Zhang so unlucky? Because the underwater toilets on submarines are very complicated. We shit on the ordinary train, the toilet leads to the track, pulls it out, falls, and it's over. However, the submarine is underwater, and if the toilet is directly connected with the outside world ... The submarine will sink when the water comes in ... Therefore, the submarine's underwater toilet must have safety precautions, and the operation sequence is as follows:

1, discharge the feces into the toilet (your ass will pout), and you should remember to clean your ass;

2. Then open the entrance of the toilet manure box (your toilet doesn't have this);

3. Open the sea valve and flush the excrement into the excrement box with seawater (similar to flushing the toilet in your house);

3. Close the entrance to the toilet (you certainly don't know);

4. Open the outlet cover of the dung box to the seawater outside the submarine (so that the dung can go out);

5. Unscrew the valve of the high-pressure gas tank forcibly, and blow the excrement in the excrement box out of the ship with high-pressure gas (there are floating objects on the water);

6. Immediately close the manure box outlet.

After using the toilet for the first time.

So simple?

This problem is far from simple ... because the submarine has a water depth problem. For example, if you blow away feces at a water depth of 50 meters, the air pressure in the feces box must be as far as six atmospheres to blow away (one atmosphere at sea level and one atmosphere every ten meters underwater). Generally, it is XX atmospheric pressure. Blow it clean with a bang, and then close the air outlet cover immediately. The toilet is finished.

Well, you blew away the feces at a depth of 50 meters, then went to the toilet and left. How much atmospheric pressure is left in the manure box?

At least six atmospheres! (Actually, it is XX atmospheric pressure. In order to prevent seawater from flowing backwards, the front cover of the manure box is closed at the moment of blowing. There was XX atmospheric pressure in the manure box at that time. The blowing pressure of each submarine is different, which involves the survival depth of the submarine, so the specific data has been deleted).

The second person who goes to the toilet has to go through one more procedure. First, use a special exhaust valve to pump the XX atmospheric pressure out of the dung box, otherwise you will open the toilet to the entrance of the dung box later ... bump! XX atmospheric pressure forces feces to flow back, but that's worse than champagne, right? Instantly, the feces are shattered. Congratulations, you won the lottery!

I think that's how director Zhang won the grand prize.

So the second person who goes to the toilet must:

0, check the dung box pressure gauge, open the air valve, reduce the XX atmospheric pressure in the dung box;

1, discharge feces into the toilet and wipe your ass;

2. Then open the entrance of toilet manure box;

3. Open the sea valve and flush the excrement into the excrement box with seawater;

3. Close the entrance to the toilet;

4. Open the outlet cover of the dung box leading to the seawater outside the submarine;

5. Unscrew the valve of the high-pressure gas tank forcibly, and blow the excrement in the excrement box overboard with high-pressure gas;

6. Immediately close the manure box outlet.

You learned?

No, you sank! Because I forgot to tell you in the above steps, the sea valve should be closed immediately after the excrement is flushed into the excrement box. ...

Welcome to flight U- 1206. Now the sea is going backwards ... Please come up urgently. ...

Dude, do you still want to go to the bathroom? I guess you're scared silly.

Then you will ask me: What about peeing?

I replied: men can put them in the urinal and get on the boat temporarily. The last time I washed it, it was still so troublesome.

The trouble is not over yet. Submarine toilets are restricted by water depth and sea area ... It is forbidden to use in the activity area of enemy anti-submarine forces according to regulations. Blow off special high-pressure gas noise, bubbles can be seen on the water surface, and toilet paper floats. The toilet paper for submarine should be easily dissolved and dispersed. Of course, it's not as special as some people say. It's just rotten paper with short fiber and easy to melt, so, oh, if you have diarrhea, wipe it up quickly, otherwise the feces will easily penetrate into the paper ... haha.

So there is a theoretical basis for saying that the toilet problem caused the sinking.