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Trials with HM Submarine Seraph
In 1944 the Royal Navy succeeded in modifying one of its conventional submarines, Seraph, to match the performance of the radically new Type XXI fast boats that intelligence showed Germany was developing.1 If the enemy had succeeded in getting the Typ XXI to sea in large numbers, they would have revolutionised submarine warfare, and severely tested Allied anti-submarine defences.
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As greed and desperation take control, the increasing uncertainty of the mission causes the men to turn on each other to fight for their own survival.
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