I was watching a documentry about a Russian submarine being dismantled and there was a small bath to have a swim in on the boat. This is not a wind up honestly! Admittedly it was tiny but it was used for fitness.
Brought back a few memories there, mostly involving the afterplanesman that uttered the immortal words, leave this to me, forewardplanesman would take his hands off the tapper gear and watch with glee the increasing and sometimes frantic efforts of the afterplanesman to keep on depth. It usually ended when the OOW realised what was happening.