Because working conditions for "The Frogmen" were deemed too "riotous" for women, all female roles were written out of the screenplay and none appeared in the completed film. Jack Warden makes an uncredited appearance in the beginning of the film as a crew member of the transport ship. Co-star Gary Merrill, in the role of the captain of UDT-4's transport ship, delivers the line of dialog, "Looks like you've got what amounts to a legal mutiny on your hands", that is virtually identical to a line that he spoke two years earlier in the World War II Army Air Force drama "Twelve O'Clock High".