Spies have more tools at their disposal than bribery, blackmail, and black bag jobs. They’ve also got pickaxes. When going undercover isn’t enough, they go underground to ply their trade. Here are five spy operations that involved digging tunnels to get the job done.
1. Operation SILVER
Post-World War II Vienna was divided into four zones, each controlled by either the British, the Americans, the French, or the Soviets. (A central district was jointly managed, with governance rotating monthly... READ ON