Almost seven decades after the end of the war, residual explosives that were hardly taken seriously for a long time are now coming to light in the North and Baltic Seas. Experts estimate that there are 1.6 million metric tons of conventional and chemical ammunition in German territorial waters alone, unexploded time bombs lying in or on the sea floor. The unexploded ordnance (UXO) includes giant aerial bombs weighing hundreds of kilograms, 15-kilo shells, small high-explosive shells, hand grenades, detonators and ammunition rounds, for a total of more than 50 million individual items.
Nothing like a little mustard gas to spoil your fishing trip.
(h/t Jonathan Beard)