"Another vote for The Cruel Sea. In my opinion the finest film of war at sea ever made."
Yes
The rest are largely rubbish. My god, "Sink the 'Bismarck'" remains the most amazing impressionistic recreation of big ships at sea, and in action ever made. Even CGI would likely not exceed what they did. The Prince of Wales struggling against Bismarck remains the most memorable modern warship battle scene. The huge ship surrounded by shell splashes is an epic. The scene where the camera cuts to the Boy Sailor as Hood sinks, is one of the great images in cinema. The completely fake handling of the Germans does not matter. When the film was made next to nothing was known about the German side in the UK and US As a cinematic tour de force, it remains unexcelled except by . . .
The most impressive recreation of a naval battle ever made was done by the Japanese in "Saka No Ue No
Kumo" ("Clouds Above the Hill").
https://www.youtube.com/watch?v=erk83OXMvYoAs for "Greyhound", an appallingly silly fantasy of American omnipotence.
"Das Boot" is impressive, but I find the "modern" submarine captain rather a pander. My father was in an American submarine in WWII. I never expected him to be like someone of my generation, and he decidedly was not. After what he told me about being in the submarines, we have yet to see even an approximation of what it was like on the American side. One of the most interesting incidents he recounted was when the captain prevented his exec from slaughtering Japanese sailors in the water, after sinking their ship. My father said none of the whitehats wanted to be part of it "All seamen feel pity for the shipwrecked."