1956 B-47 disappearance

The 1956 B-47 disappearance occurred on 10 March 1956 over the Mediterranean Sea.

Flight
A Boeing B-47 Stratojet took off from MacDill Air Force Base, Florida, in the United States for a non-stop flight to Ben Guerir Air Base, Morocco and completed the first aerial refueling without incident.

After descending through solid cloud to begin the second refueling, at 14,000 ft (4,267 m), B-47E serial number 52-534, failed to make contact with its tanker.

The unarmed aircraft was carrying two capsules of nuclear weapons material in carrying cases; a nuclear detonation was not possible.

Aftermath
Despite an extensive search, no debris were ever found, and the crash site has never been located. The crew has been declared dead.