Submarine X-1 is currently streaming on Prime Video

Submarine X-1 (1968)89 minAction, WarRating 54/100

After a Royal Navy officer loses fifty crew members and his submarine, the Gauntlet, in a battle with the Nazis, he’s sent to lead a top-secret mission with three experimental miniature subs...to sink the same battleship that destroyed the Gauntlet!

Cast: James Caan, David Sumner, Norman Bowler, Paul Young, Brian Grellis, William Dysart, John Kelland

Director: William A. Graham