The Russians Are Coming! The Russians Are Coming!

Maverick Navy Lieutenant Commander Tom Dodge will never be a textbook officer, but he's a brilliant seaman who's always wanted to command a nuclear submarine — he's been given one last chance to clean up his record. Unfortunately, Admiral Graham, his nemesis, would rather sink the fleet than give Dodge his own boat. So, Graham stacks the deck against him and assigns Dodge to the Stingray, a diesel-powered WW2 submarine that can barely keep afloat. To make matters worse, Dodge's crew is a collection of maladjusted, mistake-prone misfits. Then, he's tagged the "enemy" in a crucial war game, and ordered to take on the U.S. Navy's best.

Merchant Marine sailors Joe Rossi (Humphrey Bogart) and Steve Jarvis (Raymond Massey) are charged with getting a supply vessel to Russian allies as part of a sea convoy. When the group of ships comes under attack from a German U-boat, Rossi and Jarvis navigate through dangerous waters to evade Nazi naval forces. Though their mission across the Atlantic is extremely treacherous, they are motivated by the opportunity to strike back at the Germans, who sank one of their earlier ships.

In the midst of World War II, the battle under the sea rages and the Nazis have the upper hand as the Allies are unable to crack their war codes. However, after a wrecked U-boat sends out an SOS signal, the Allies realise this is their chance to seize the 'enigma coding machine'.

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

Milquetoast Henry Limpet experiences his fondest wish and is transformed into a fish. As a talking fish he assists the US Navy in hunting German submarines during World War II.

A by-the-book Captain is ordered to capture a strategic village in Italy. The Italian soldiers are willing to surrender, if they can have a festival first. The lieutenant convinces the Captain this is the only way. Because of aerial reconnaissance, they must look like they are fighting. To sort this out an intelligence officer is sent in. Meanwhile the festival gets complicated with the Mayors daughter.

A German submarine is sent to the Orkney Isles in 1917 to sink the British fleet.

During World War II, Captain Cassidy and his crew of submariners are ordered into Tokyo Bay on a secret mission. They are to gather information in advance of the planned bombing of Tokyo. Along the way, the crew learn about each other as they face the enemy and some of them lose their lives.

A German spy is passing on information about the location of Allied ships in the neutral harbor of Goa, India, with catastrophic results. Unable to undertake a full military operation in the Portuguese stronghold, English intelligence brings out of retirement a crew of geriatric ex-soldiers, veterans from World War I, using their age as cover. These old soldiers are asked to take to the seas and pull off an unlikely undercover mission.

The working-class Smiths change their initially sunny views on World War I after the five boys of the family witness the harsh reality of trench warfare.