Merchant Marine sailors Joe Rossi (Humphrey Bogart) and Steve Jarvis (Raymond Massey) are charged with getting a supply vessel to Russian allies as part of a sea convoy. When the group of ships comes under attack from a German U-boat, Rossi and Jarvis navigate through dangerous waters to evade Nazi naval forces. Though their mission across the Atlantic is extremely treacherous, they are motivated by the opportunity to strike back at the Germans, who sank one of their earlier ships.
| Writing | John Howard Lawson | Screenplay |
| Crew | A.I. Bezzerides | Additional Dialogue |
| Production | Jack L. Warner | Executive Producer |
| Production | Jerry Wald | Producer |
| Writing | Guy Gilpatric | Story |
| Directing | Lloyd Bacon | Director |
| Crew | W.R. Burnett | Additional Dialogue |
| Camera | Ted D. McCord | Director of Photography |
| Editing | George Amy | Editor |
| Sound | Adolph Deutsch | Original Music Composer |
| Costume & Make-Up | Milo Anderson | Costume Design |
| Art | Clarence Steensen | Set Decoration |
| Art | Ted Smith | Art Direction |
| Costume & Make-Up | Perc Westmore | Makeup Artist |
| Sound | C.A. Riggs | Sound |
