HMS X1 was a British "cruiser submarine" designed after World War I as a submersible commerce raider, intended to attack enemy shipping by overpowering escorts with its heavy gun armament. Launched in 1923 and commissioned in 1925, it was the largest submarine in the world at that time, featuring four 5.2-inch guns and six torpedo tubes. However, X1 suffered from persistent mechanical issues with its diesel engines and was deemed impractical due to the difficulties in operating such a specialize

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