"There are perfectly-preserved shipwrecks from ancient Greece preserved at the bottom of the Black Sea. The water is so deep that it becomes anoxic (oxygen free), which preserves organic materials like wood.
Shipwrecks are cool, but I find the phenomenon a little disturbing, since there is probably no life down there."
Not a bad idea but you might want to avoid the word dumping.
Burial at sea is the more common term.
More likely than not the writer was referring to Hawley Harvey Crippen. Check out the article at www.thehistorypress.co.uk/articles/the-notorious-case-of-dr-crippen/