The Russians Are Coming! The Russians Are Coming!

จอห์น นายทหารเก๋าประสบการณ์ ผู้เคยยึดติดตำราและวินัยทหาร เขาคือผู้บังคับการเปี่ยมฝีมือ ที่ใฝ่ฝันจะได้บัญชาการเรือดำน้ำติดอาวุธนิวเคลียร์ แต่โชคร้าย จอห์นกลับได้ถือหางเสือเรือกระป๋องเครื่องยนต์ดีเซลส มัยสงครามโลกครั้งที่ 2 พร้อมลูกเรือไม่เต็มบาททีมหนึ่ง

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

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.

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.

Defiant's crew is part of a fleet-wide movement to present a petition of grievances to the Admiralty. Violence must be no part of it. The continual sadism of Defiant's first officer makes this difficult, and when the captain is disabled, the chance for violence increases.