I like two stories of how the US intelligence located both uranium enrichment plants in operation in mid-1950s USSR: one near Tomsk they identified in 1956 by verifying rumors from a German tailor with an isotopic analysis of uranium traces on a fur hat, the other one near Sverdlovsk in 1958 by an analysis of a photo from an electricity dispatching office published in a Soviet magazine! OSINT at its finest in the latter case
I like two stories of how the US intelligence located both uranium enrichment plants in operation in mid-1950s USSR: one near Tomsk they identified in 1956 by verifying rumors from a German tailor with an isotopic analysis of uranium traces on a fur hat, the other one near Sverdlovsk in 1958 by an analysis of a photo from an electricity dispatching office published in a Soviet magazine! OSINT at its finest in the latter case