

On leave in Italy, Lt. Tommy Knowlton falls in love with Jean Standish, who's not only married, but is the daughter of his submarine's commander. Friction between the two officers becomes intolerable once at sea and after Commander Toler is forced to abandon Tommy's best friend topside while the sub dives to escape enemy planes, Tommy is no longer able to contain his anger.
Practical Effects
Massive interior submarine sets built at MGM — still impressive.
Acting
Walter Huston plays gruff commander like he's personally offended by romance.

Director
Jack Conway
Trivia, insights & behind the scenes
The massive submarine set cost $150,000 — equivalent to $3.5 million today — and could flood on command.
Released months before the Hays Code crackdown, this got away with on-screen adultery and blunt sexuality that vanished for decades.