The 'X' stood for experimental, but it might equally have meant extraordinary, exotic or extravagant, as this giant submarine attracted superlatives--the world's largest, most heavily armed, and deepest diving submersible of the day. X.1 was a controversial project conceived behind the backs of politicians, and would remain an unwanted stepchild. This book explores the historical background of submarine cruisers, the personalities involved in X.1's...
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History