Heric, our navy sank a frigate in good diving depth and clear water after stripping out all the toxic bits and cutting access holes here and there. The demolition specialists were delighted, and it was on TV so they were happy, too. It has been very popular with divers ahd the people in the hospitality industry in that remote locality.   And with the fish.

Waste of good steel, though. Nor has anyone reported where the toxic bits went.....