Inside NEPTUN, a Daring Cold War Disinformation Operation | WIRED
In April 1964, several months after Austria called off its search, the producers of Czechoslovak TV’s Curious Camera decided to mount a similar expedition in their own country. They dispatched a team of divers and a documentary film crew deep into the Bohemian Forest—halfway between Munich and Prague and almost directly on the border between East and West—to a pair of adjacent lakes, Devil’s Lake and Black Lake. During the war, Wehrmacht and SS units had occupied a now burned-out cottage overlooking Black Lake, and local lore had it that the bodies of water were hiding a dark secret.