This settlement is out at sea, about 8m underwater.
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”
That makes it harder to protect against treasure hunters not easier.
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”