Plot: The crew of submarine H.M.S. Sea Tiger have their leave (and assorted family problems) cut short when they are recalled for a special mission: sink the new German battleship Brandenburg. En route, they learn that their target has entered the heavily defended Baltic. Rather than fail, they follow it. Tension builds as they approach their target. After the attempt, escape seems impossible, unless they can refuel in enemy waters.
Alternative Plot: In the midst of World War II, the crew of the submarine HMS Sea Tiger finds their long-awaited shore leave suspended when they're given a new mission. Germany's brand-new battleship, the Brandenburg, is crossing open waters on its way to the Baltic Sea, giving commanding officer Lt. Taylor (John Mills) and his crew a chance to destroy it. But when the ship enters the well-fortified Baltic, Taylor must decide whether to chase after their quarry, not knowing if they can make it out alive.
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