These have been converted to basically ticking time bombs as the metal and fuel tanks corrode.
The amount of oil in these sunk ships is difficult to estimate, but even on a light estimate resulted in a wide-spread ecological disaster.
As usual the response from 95% of governments out there is simply to bury their heads to the problem.
Source from DW Documentaries (https://www.youtube.com/watch?v=OP0U62oiBlM)
The ship was wrecked off the Nore sandbank in the Thames Estuary, near Sheerness, England in August 1944, whilst carrying a cargo of munitions. About 1,400 tonnes (1,500 short tons) of explosives remain on board, which continues to be a significant hazard.
Tom Scott: https://youtube.com/watch?v=R9u41aeItss
Most of the explosives are inert but there are cluster munitions on the top deck IIRC that if nudged too much could set the whole thing off.