Which country mass-produced speedboats packed with explosives as a weapon during WW2?

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The Shinyo ("Sea Quake") were Japanese suicide boats, driven by one man, to speeds of around 30 kn (56 km/h; 35 mph). Around 6,200 Shinyo were produced for the Imperial Japanese Navy and stored on the coast of Japan for the ultimate defense against the invasion of the Home Islands. Only a small number of them were used in action in the Phillipines and Okinawa, sinking some gunboats and auxiliary ships.
Cleo
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Very interesting!
reach: rather globalhistoryhistory of JapannavyweaponryweaponsWorld War II

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