Crew Quarters

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Originally Posted by Rosencrantz

I think in USN they use to drive the boat so, that there was a older officer acting as Officer of the Deck (on the Deck?) = WO and a younger officer in the control room.

Age was not the deciding factor, being submarine qualified was. Of course it was more likely that the senior offficer was qualified ahead of the younger one, but not always, especially since officers may have come from surface or other duty to submarines.

The OOD would become the dive officer when submerging so it could be done quickly.

FWIW, the chief that was in charge of the crew was called the Chief of the Boat on US submarines.