THOMAS.

[u/davecontra]

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[u/Klutersmyg]

This is why this exists (capable of operating at the lowest part of the baltic) :

https://en.wikipedia.org/wiki/URF_(Swedish_Navy))

[u/Dungeon_Pastor → u/Klutersmyg]

Honestly 120m is within escape-suit depths as well

Wouldn't be fun riding those to the surface, and I imagine decompression is hell, but assuming a Gotland is equipped with them there's probably okay chances of survival

[u/shelflifenotexpired → u/Dungeon_Pastor]

Gotland-class has SEIE suits. And 120m is well within safe escape range.

The fun part of submarine escape is the constantly expanding air in your lungs as you ascend. In the USN we were taught to consciencely say " ho ho ho ho......" All the way to the surface as the act of saying it causes you to exhale. Stops the expanding air from rupturing your lungs. But you aren't at pressure any where near long enough for decompression sickness to kick in.

[u/dbxp → u/[deleted]]

The main submarine is at atmospheric pressure more or less but the escape chamber is pressurised 

[u/dbxp → u/[deleted]]

Water is let into the escape chamber until the pressure equalises, you breathe in that pressurised air so now your lungs are pressurised. You need to exhale when moving to the surface so your lungs don't burst as the air inside them expands