1.6 Million+ Tons of Sea-Dumped Chemical Weapons Have No Cleanup Plan

Between 1918 and 1970, the U.S. military alone dumped chemical weapons at sea on at least 74 occasions. Russia has acknowledged that at least 160,000 tons of chemical weapons may rest on its seabeds. Combined with British, French, Italian, Japanese, and other nations' dumping, the global total exceeds 1.6 million tons of chemical warfare materiel deliberately sunk in oceans worldwide. There is no international framework, no dedicated funding, and no proven technology for cleaning any of it up. The urgency is escalating because corrosion is not linear -- it accelerates as casings thin. Some projections suggest bomb casings will fully disintegrate within the next decade, while shell casings may corrode through by 2100. When casings fail, the agents inside do not simply dissolve harmlessly. Mustard gas, for example, forms solid lumps on the seabed that persist for decades and can be picked up by fishing nets, dredging operations, or offshore construction equipment. As nations expand offshore wind farms, lay submarine cables, and develop deep-sea mining operations, the probability of disturbing dump sites increases. The 29th Conference of State Parties to the CWC discussed sea-dumped weapons in November 2024, but discussion is not action. The problem is structurally intractable for several reasons. First, dump site records are incomplete -- many nations dumped weapons with minimal documentation of exact locations, quantities, or agent types. Second, the CWC was not designed to address sea-dumped weapons; its verification regime focuses on declared stockpiles and production facilities, not historical ocean disposal. Third, the technical challenge is enormous: retrieving corroded munitions from depth risks catastrophic rupture, and in-situ destruction technologies are unproven. Fourth, liability is unassigned -- the dumping nations acted legally under international law at the time, and no treaty obligates them to remediate. The result is a slow-motion environmental catastrophe with no responsible party.