In 1958, MGM released this film on a double bill with The Safecracker (1958) and the tag line "UNDERSEA PERILS and UNDERCOVER THRILLS!"
The USS Grasp was used in the filming of this movie. During production, Dan Dailey insisted on bringing a sizable amount of beer. However, it was against naval policy to drink on a navy vessel, and so he arranged for a "camel" (a platform tied to the side of the ship to allow the ship to be painted, etc.) so that the crew members could drink the beer. They would go down on the camel, drink their fill and then climb back onto the ship.
The United States Navy's Underwater Demolition Team (UDT), commonly referred to as frogmen, was created during World War II in 1942. They were originally set up for reconnaissance and underwater demolition of natural or man-made obstacles obstructing amphibious landings. They were the predecessors to the current US Navy SEAL Teams, which is why SEALs are called frogmen. With the advent of scuba gear, the UDT's role started to become more tactical and elite. Following the Vietnam War, commando training was added to the UDT, leading them to become the Navy SEALs. Though not all of the UDT teams became commandos and SEALs, the units that didn't receive the elite command training came to be known as Special Boat Units and Swimmer Delivery Vehicle Teams (SDVTs). The SDVTs and Special Boat Units became responsible for standard underwater demolition and for operating and maintaining the small craft used for special operations missions.