Richard Widmark

as Captain Eric Finlander, U.S.N.

Sidney Poitier

as Ben Munceford

James MacArthur

as Ensign Ralston, U.S.N.

Martin Balsam

as Lieut Cmdr. Chester Potter, M.D., U.S.N.

Wally Cox

as Seaman Merlin Queffle

Eric Portman

as Commodore Wolfgang Schrepke, Deutsche Marine

Michael Kane

as Commander Allison Executive Officer - Bridge

Gary Cockrell

as Lieutenant Bascombe U.S.N. - C.I.C.