This is news?
Everything was dumped in the ocean BITD.
Minimata was 1956.
One of the irreparably irradiated ships from the initial nuke testing is on the bottom off of SF Bay. The others are elsewhere in the Pacific.
New York City barged it's garbage out into the Atlantic for decades until it started coming back onto the Long Island beaches
Howe sound, a fjord which I live beside, is 26 miles long and 1000 ft. deep. It was virtually dead back in the 70's from pulp mill effluent (Dioxin) as well as copper mine runoff
Ocean dumping is not nearly as bad now but it's