Héroes del mar

Though this takes place on a warship, it bears resemblance to WB's Action in the North Atlantic also of 1943 which is set on a merchant ship. Randolph Scott is the sheriff uh captain of the named ship,among the crew is a young Robert Mitchum. Mr. Scott delivers but not until the postwar period will he develop in my mind the seriousness that saved him from the wooden Indian junk heap. The final duel between the U Boat and the corvette is exciting and (very rare in films of this era)the enemy are portrayed as formidable foes.

A pretty good not great action film if say this film and the Magnificent Seven or the Tall T came on different channels would opt for the others with a switchback to watch the ship to sub duel.