They also did the same with Chemical weapons of Nazi Germany and Japanese but those were dumped in their seas.
MAP of US Dumping Areas (HQ map here)
On 1958 they sinked a ship off the coast of San Francisco that was filled with 301,000 mustard gas bombs.
1987: hundred of dolphis appear on Virginia and New Jersey with burns similar to mustard gas exposure.
This represent a real danger to sea life and human cuz maybe all the package present some corrosion and there maybe having leaks
Munitions dumping at Sea