The crew of the American destroyer escort, the USS Haynes, detects a German U-Boat—resulting in a prolonged, deadly battle of wits.

When Russia's first nuclear submarine malfunctions on its maiden voyage, the crew must race to save the ship and prevent a nuclear disaster.

After the Cold War, a breakaway Russian republic with nuclear warheads becomes a possible worldwide threat. U.S. submarine Capt. Frank Ramsey signs on a relatively green but highly recommended Lt. Cmdr. Ron Hunter to the USS Alabama, which may be the only ship able to stop a possible Armageddon. When Ramsey insists that the Alabama must act aggressively, Hunter, fearing they will start rather than stop a disaster, leads a potential mutiny to stop him.

A British convoy is trying to elude a group of German U-Boats.

A German submarine hunts allied ships during the Second World War, but it soon becomes the hunted. The crew tries to survive below the surface, while stretching both the boat and themselves to their limits.

It's 1940. German forces are prevailing over Allies across Europe. The crew of the Polish submarine, now serving in the Royal Navy, is waging a heroic fight against the invisible enemy.

Told in flashback, Out of the Depths strives to explain why its four male protagonists are bobbing around the Pacific in a lifeboat. The story proper begins as Captain Faversham (Jim Bannon) and his crew embark upon a secret mission which takes them into Japanese waters. The plan is to prevent a kamikaze attack against the American invading forces. Compelling in itself, the plotline isn't improved by arbitrary doses of misfire pathos and comedy relief. One of the sailors is played by Ken Curtis, later to gain TV fame as Festus on Gunsmoke.

The story of the WWII project to crack the code behind the Enigma machine, used by the Germans to encrypt messages sent to their submarines.

India’s first underwater war film tries to decode the mystery behind the sinking of Pakistani submarine PNS Ghazi during the Indo-Pak war of 1971.

Near the end of WWII a lone U-Boat is sent from Germany to Japan carrying plutonium needed for a Japanese A-Bomb. During the long journey, news arrives on the radio that Hitler killed himself and Germany has surrendered. This causes a rift in the crew, the Nazi Party members wanting to continue to Japan since they are still at war, while the others just want to surrender or return home.

A World War II submarine commander finds himself stuck with a damaged sub, a con-man executive officer, and a group of army nurses.

In the days after the attack on Pearl Harbor, panic grips California, where a military officer leads a mob chasing a Japanese sub.