Watched a few very different ones on Netflix, though my favourite so far has been Das Boot.
It's very realistic and puts you in the position of a fly on the wall inside the U-boat. Set roughly 6 months after the original from the 80's, it concerns a different sub, on a secret mission, and deals with the human pressures on the crew, and how they get through things (or don't..).
If you like a thinking drama with morals, then this is for you.