Reagan and Gorbachev agreed to pause the Cold War in case of an alien invasion.
During the Cold War the CIA spent $3.8B to construct a ship with a 16,000ft underwater claw arm in order to retrieve a sunken Soviet nuclear submarine.
The CIA’s concern over soccer fields along the coast of Cuba led to the Cuban Missile Crisis. In September 1962, a CIA analyst noticed the fields and became concerned because, as he put it, “Cubans play baseball, Russians play soccer.”
The Tsar Bomba, the single most physically powerful device ever used, had a mushroom cloud over 7 times the height of Everest. The shockwave circled the earth 3 times and caused windowpanes to be partially broken at distances of 900 km (560 mi). The original design was twice as large.
In 1986, a sysadmin looking into a $0.75 accounting error uncovered a KGB hacker that was stealing nuclear secrets.
As an act of psychological warfare the US army planned to drop extra large condoms labeled as medium in the Soviet Union to demoralize the Soviets.
In 1945 a group of Soviet school children presented a US Ambassador with a carved US Seal as a gesture of friendship. It hung in his office for 7 years before discovering it contained a listening device.
In 1960, the computer at NORAD warned with 99.9% certainty that the Soviets had just launched a full-scale missile attack against North America. NORAD later discovered that the Early Warning System in Greenland had interpreted the moon rising over Norway as a missile attack from Siberia.
NATO founded a secret organization which would stay behind and fight a guerrilla war in case of a Soviet invasion. This same organization was linked to multiple terrorist attacks throughout Europe.