We Dive at Dawn (1943)

Synopsis:
Britsh submarine 'Sea Tiger' docks after a long voyage and the crew are given a week's leave. Each heads off for his chosen destination. However al their arrangements are cancelled as they are recalled to their sub and instructed to find and destory a Nazi battleship, the 'Brandenburg'. On their way, they pick up three German seamen who tell them where the ship lies in the treacherous Baltic Sea. When they eventually find it they fire their torpedoes but must beat a hasty retreat. They do not know if they were successful and must return to port quickly to refuel, not knowing if the 'Brandenburg' is following them.
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