Lots of areas were used to dump surplus munitions at the end of both world wars. North Sea, Irish Sea[1], Baltic[2], Gulf of Mexico[3], and many other places.

Lots of areas were used to dump surplus munitions at the end of both world wars. North Sea, Irish Sea[1], Baltic[2], Gulf of Mexico[3], and many other places. In the case of the Irish Sea, which was the main MoD dump since around 1920, 14,600 tons of Phosgene, and by 1949 the RAF alone had dumped 137,000 tons. It ceased being used in 1973. [1] In the Baltic fishermen catch upto 3 tons of munitions each year. BP turned up quite bit of unexploded ordnance while exploring for their now infamous Gulf of Mexico rig. [1] http://www.telegraph.co.uk/news/uknews/1488371/MoD-dumped-munitions-in-the-Irish-Sea.html http://www.telegraph.co.uk/news/uknews/1488371/MoD-dumped-mu... [2] http://www.spiegel.de/international/europe/world-war-ii-munitions-dumps-a-rusting-timebomb-in-the-baltic-a-475520.html http://www.spiegel.de/international/europe/world-war-ii-muni... [3] http://usnews.nbcnews.com/_news/2012/09/28/14141378-world-war-ii-bombs-mustard-gas-in-gulf-of-mexico-need-to-be-checked-experts-warn?lite http://usnews.nbcnews.com/_news/2012/09/28/14141378-world-wa...