US once lost an active Hydrogen bomb near Spain
On January 17, 1966, a B-52 bomber crashed into a jet refuelling aircraft, dropping three 70-kiloton hydrogen bombs near the Spanish town of Palomares and one at an unknown location in the Mediterranean. The damaged bomb was recovered within three months using 33 US Navy vessels. The event known as "Broken Arrow" is among three-dozen accidents recognised by the US.