In 1966, the US lost a hydrogen bomb in the Mediterranean Sea, and struggled to find it.
Four hydrogen bombs fell to earth neat the fishing village of Palmares. Three members were killed during this incident. Although the explosives were supposed to detonate from two to four hours there was no nuclear holocaust. However a lot of radioactive contamination occurred around the area.
One of the bombs landed in the sea and went missing for 80 days. The U.S struggled to find it and had to call an intensive search. A local fisherman saw how the bomb hit the water and enlisted to help the U.S. Finally, the fisherman found it and asked the U.S for the $20 million finder’s reward that the US owed according to law!
I bet that bomb was the biggest treasure that the fisherman ever found!