Cold War / 1955–1956
The tunnel that wasn’t a secret.
What if the other side knew about your secret operation before it began?
During Operation GOLD, American and British intelligence tapped Soviet communications through a tunnel in Berlin. But George Blake, a Soviet agent inside British intelligence, had already disclosed the plan. The tunnel still operated for months: exposing it too soon risked revealing the source of the leak.
Look closer
A secret operation can be both compromised and productive. In espionage, protecting a source can matter more than stopping an adversary.