Operation Cherry Blossoms at Night - Wikipedia
Bubonic plague ,now I don't feel so sorry for Hiroshima. A bit like not worrying so much about bombing Dresden etc. after discovering the V1&V2 existed.
During the last months of the war, Ishii was preparing for a long-distance attack on the United States. This operation, codenamed "Cherry Blossoms at Night", called for the use of airplanes to spread plague in the American's naval base in San Diego at night. The plan was finalized on March 26, 1945. Five of the new I-400-class long-range submarines were to be sent across the Pacific Ocean, each carrying three Aichi M6A Seiran aircraft loaded with plague-infected fleas. The submarines were to surface and launch the aircraft towards the target, either to drop the plague via balloon bombs, or to crash in enemy territory. Either way, the plague would then infect people in the area. The mission was extremely risky for the pilots and submariners, likely a one-way kamikaze mission. A pilot under the command of Ishii, Ishio Kobata, recalled the plan in 1998:
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