I know of 4 entries into the pressure hull:
1) Forward torpedo loading hatch
2) Conning tower
3) Provisions hatch (above galley)
4) Aft torpedo loading hatch
I ask because on my youtube video, there is a guy who suggests a torpedotube 1 above water which the crew would use as only officers would use the conning tower hatch.
Im sure he is wrong, but still want to double check my understanding.
If you want to jump into the conversation its here :
The one posting is a guy called Corwardly Custard
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