If I were asked to recommend three great movies about any Allied or Axis army, navy and air force in World War II, they would be "The Desert Fox", "The Cruel Sea" and "Twelve O'Clock High". All three were made in black and white soon after the war, and all have the unmistakable realism of true accounts.
"The Cruel Sea", based on the famous Nicholas Monsarrat novel of the same title, lend its story beautifully to the stark contrasts and subtle mid-tones of black and white film (you don't get all those mid-tones of grey in color film). The story is grippingly personal, tragic and redeeming, gradually and painfully building the intense bond of camaraderie that seems to be particularly strong among navy people - probably because the sea can be the loneliest and most unforgiving place on earth (hence the title). Recalling the names Compass Rose and Saltash Castle, you'll taste the freezing brine of the North Atlantic, smell the mix of diesel fuel, blood and cordite, and hear the cries of your mates drowning in your wake. The real deal in black and white.