Greyhound

Greyhound is a Tom Hanks movie based on C.S. Forester's book The Good Sheperd.

Hanks did a good job on the screenplay and in the title role, even though he might be a tad bit old for the role of CDR Krause, the destroyer's captain and commander of the convoy's escorts. It's a pretty good look at the grittiness of the Battle of the Atlantic, which was the longest battle of the war. The movie takes place in the Black Pit, the area of the North Atlantic that was not covered by land-based ASW aircraft.[1]

Now, some technical quibbles:

At the beginning of the movie, Krause tells his girlfriend that he is getting his first command, a newly-built Fletcher class destroyer. I get the reasoning behind it: Much of the movie was shot aboard USS Kidd, one of the few surviving Fletcher DDs and the only one largely in her WW2 configuration. The lead ship was not in service until after the time when the movie is set and anyway, the Fletchers were designed to have longer range than her predecessors -- as far as I know, they all served in the Pacific Theater. The USN destroyers in the battle were older, older than most of the sailors manning them. When new ships began showing up, they weren't "fleet destroyers", like the Fletchers (which were designed to keep up with carriers and battleships), they were "destroyer escorts", which weren't as fast and had diesel-electric, steam turboelectric and diesel-direct propulsion. Steam reduction gears were expensive and time-consuming to make, so they were installed only on warships needing the speed. Convoys tened to sail at about eight knots.

But I digress.

The scenes shot on the ship didn't show any effects of sea motion, which makes sense, because the Kidd is moored/drydocked in Baton Rouge. They got a lot of stuff right, but they occaisionally messed up on the orders to the helm and lee helm.[2]. And the captain wasn't returning salutes, which, given that all captains in 1942 had graduated from The Boat Skool, was not accurate.

The movie didn't underplay or highlight the racism of the day, when Black men were limited to being mess attendants.

The movie, of course, is a CGI-fest, but there was probably no other way to do it. If you have Apple TV+, ot'swell worth the time.
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[1] Among the many things that "Bomber Harris should be rotting in Hell for, his extreme resistance to providing aircraft to Costal Command for long-range patrols, let alone equipping them with airborne radar, should be near the top.
[2] The "lee helm" is the engine-order telegraph.