The City Used as a Biological Test

from The Cold War’s Secret War for the Human · host Tommy

This episode tells the dark story of Operation Sea Spray, a secret U.S. military biological warfare test carried out over San Francisco in 1950. Bacteria believed at the time to be harmless were sprayed offshore to study how a biological attack might spread through a major city, without the public’s knowledge or consent. In under three minutes, the episode asks what happens when a government turns its own citizens into an unwitting laboratory.

Episode metadata supplied by the publisher feed · Published Jun 3, 2026

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