Moving through the submarine is very slick and nice. Holding down shift key while moving, allow for running.
But the lady-shoe-tap sound effect has to go
One easy thing the devs could do, was to create alot of dialogue for the crew. So that no dialogue appeared twice. It would be easy to write dialogue, where you could even write variants to any single expression. E.g "Hello" could also be "Hi" or "Greetings" in the real world.