https://www.bbc.com/news/world-asia-37997640:
“Three Dutch World War Two ships considered war graves have vanished from the bottom of the Java Sea, the Dutch defence ministry says.
[…]
A report in the Guardian says three British ships have disappeared as well.
[…]
the three missing wrecks were located 100km (60 miles) off the coast of Indonesia, at a depth of 70m”
I never understood the war graves thing. On land, people go to great effort to recover the bodies and re-inter them in proper graves. In the sea, they get designated as graves and nothing can be salvaged.