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    $\begingroup$ Check out how Japan's Unit 731 tried to use germ warfare in China. en.wikipedia.org/wiki/Kaimingjie_germ_weapon_attack $\endgroup$ Commented Dec 15, 2025 at 16:05
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    $\begingroup$ Especially biological warfare makes a lot of sense. Development is plausible since even a small lab can simply get lucky in their strains mutations and with only seaborne targets it's realistic enough to ignore the threat of a breakout (especially in a "we do this or we capitulate"-scenario). WW2 ships living quarters are quite cramped so if you get a ship, you get the whole ship with decent luck $\endgroup$ Commented Dec 17, 2025 at 12:41