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X.1: The Royal Navy's Mystery Submarine

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The untold story of the Royal Navy's experimental submarine cruiser, built in secret after WWI, and torpedoed by political propaganda.

The 'X' stood for experimental, but it might equally have meant extraordinary, exotic or extravagant, as this giant submarine attracted superlatives. Built in the early 1920s, it was the world's largest, most heavily armed, and deepest diving submersible of the day. A controversial project conceived behind the backs of politicians, X.1 would remain an unwant...