It is 1942 and the German submarine fleet is heavily engaged in the so-called "Battle of the Atlantic" to harass and destroy British shipping. With better escorts of the destroyer class, however, German U-boats have begun to take heavy losses. "Das Boot" is the story of the crew of one such U-Boat, with the film examining how these submariners maintained their professionalism as soldiers and attempted to accomplish impossible missions, all the while attempting to understand and obey the ideology...

In the midst of World War II, the battle below the seas rages. The Nazi's have the upper edge as the Allies are unable to crack their war codes. That is, until a wrecked U-boat sends out an SOS signal, and the Allies realise this is their chance to seize the 'enigma coding machine'. But masquerading as Nazi's and taking over the U-boat is the smallest of their problems. The action really begins when they get stranded on the U-boat.

During the heart of World War II, in March of 1943, cryptoanalysts at Britain's code-breaking center have discovered to their horror that Nazi U-boats have changed their Enigma Code. Authorities enlist the help of a brilliant young man named Tom Jericho to help them break the code again. The possibility of a spy within the British code-breakers' ranks looms and Tom's love, Claire, has disappeared. To solve the mysteries, Tom recruits Claire's best friend, Hester Wallace. In investigating...