The loss of nuclear arms in transit deserves to be included in the ‘military nuclear accidents’ section. So far, 14 such weapons have been lost, the most famous being those that took place in 1966 in Palomares (Spain) and in 1968 in Thule (Greenland), involving plutonium 239. Over the years, 48 nuclear weapons and 11 reactors have also been lost at sea. Where uranium-based weapons are involved, the radiation risk is minimal.