It was directed by Archie Mayo, written by Jo Swerling (from a story by W.R. Burnett), and starred Tyrone Power, Dana Andrews, and Anne Baxter.

Lieutenant Ward Stewart, commanding a PT boat, sinks a U-boat, saving a lifeboat full of survivors.

Before the Corsair sails on a mission, Ward takes a weekend train, bound for Washington D.C., where he encounters New London school teacher Jean Hewlett and her students.

The DC briefing, it turns out, had involved a secret island supply base for German raiders like the Q-ship sunk earlier.

And though the raid is a great success, MacDonnell makes the ultimate sacrifice while covering the escape of Stewart and Jones from a squad of German riflemen.

As appearing in screen credits (main roles identified): Part of the film was shot at Submarine Base New London, Connecticut.

For wartime security reasons, no submarine classes used in combat in World War II appear in the film.

One of the scenes in the film was similar to that in Destination Tokyo (1943) starring Cary Grant, where the submarines follow an enemy tanker into their naval base through a minefield.

Another similar plot device was in the 1954 film Hell and High Water about an island base to be used to launch a Tupolev Tu-4, a copy of the Boeing B-29 Superfortress, in U.S. markings for an sneak atomic bomb attack.

One interesting feature of the film is the significant role of African-American actor Ben Carter as messman Oliver Cromwell Jones.