Das Boot
It is 1942 and the German submarine fleet is heavily engaged in the so called "Battle of the Atlantic" to harass and destroy English shipping. With better escorts of the Destroyer Class, however, German U-Boats have begun to take heavy losses. "Das Boot" is the story of one such U-Boat crew, with the film examining how these submariners maintained their professionalism as soldiers, attempted to accomplish impossible missions, while all the time attempting to understand and obey the ideology of the government under which they served.
Starring Jürgen Prochnow, Herbert Grönemeyer, Klaus Wennemann, Hubertus Bengsch, Martin Semmelrogge, Bernd Tauber, Erwin Leder, Martin May, Heinz Hoenig, Uwe Ochsenknecht
Watch "Das Boot" from streaming services Amazon, Philo released in 1981. It's a drama and action & adventure movie, and has a rating of 8.4 out of 10 from Imdb which is very high for this kind of movie.