Richard Widmark plays a hardened cold-warrior and captain of the American destroyer USS Bedford. Sidney Poitier is a reporter given permission to interview the captain during a routine patrol. Poitier gets more than he bargained for when the Bedford discovers a Soviet sub in the depths and the captain begins a relentless pursuit, pushing his crew to the breaking point. This one's grim tension to the end.
- Richard WidmarkCapt. Eric Finlander U.S.N.
- Sidney PoitierBen Munceford
- James MacArthurEns. Ralston
- Martin BalsamLt. Cmdr. Chester Potter M.D., U.S.N.
- Wally CoxSeaman Merlin Queffle
- Eric PortmanCommodore Wolfgang Schrepke - Deutsche Marine
- Michael KaneCmdr. Allison - Executive Officer, Bridge
- Colin MaitlandSeaman Jones - Bridge