I could immagine that would be for the lavatory waste or it could p[ossibly be a fart tube, sailors when they get the urge just stick a pipe up thier bum and blow like the wind, after all it is a diesel submarine and you dont need 40 men farting when submerged cause ya cant get rid of the stinky smell.
No i think that it most probably is a valve that will release excess pressure incase something happens to the torpedo room, cause everytime you fire you use air and if your torpedo becomes stuck pressure builds up and then it could explode (kursk incident sorta) so this will just ease the pressure off and allow you to re open the door from inside.
My theory anyway.
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