This movie and Alfred Hitchcock's Notorious are the only dramatic / serious World War II movies that feature Cary Grant. All the others are comedies, see I Was a Male War Bride; Operation Petticoat Father Goose, and You're in the Navy Now.
Two members of the real-life US Navy submarine the 'Wahoo' were consultants and technical advisers on this film, according to a story in the ' New York Herald Tribune '. They were crew member Andrew Lennox and Lt. Cmdt. Dudley Walker Morton.