During World War II Nazi forces began dumping chemical and conventional weapons in the ocean to avoid devastation by enemy aerial bombings. Following the Nazi Party's unconditional surrender in May 1945, the Allied powers continued with this practice to dispose of German arsenals.
"WWII Cleanup: Munitions Contaminate German Seas,"
Journal of Conventional Weapons Destruction: Vol. 17
, Article 19.
Available at: http://commons.lib.jmu.edu/cisr-journal/vol17/iss2/19