How did the United States discover that nuclear missiles were being installed into Cuba?

Question

Cuban exiles smuggled secret documents into the United States With help from the United Kingdom spy network
US spies in Russia found out
Pictures from a U-2 Spy plane
They decoded a secret message from Fidel Castro

Answer 1

The United States discovered that nuclear missiles were being installed in Cuba through pictures from a U-2 spy plane. In October 1962, during the Cuban Missile Crisis, a U-2 reconnaissance flight captured photographic evidence of Soviet missile installations in Cuba, which led to a significant escalation in tensions between the United States and the Soviet Union.