To all that, I would like to add that much of this steel from these ships might actually turn up on western operating tables and/or in western hospitals, a bit of neocolonialism.
As many of you probably know, ever since the atmospheric testing of nuclear weapons, the world's metal supply has been irradiated to a measurable degree.
These ships were sunk before these tests and are therefor one of the only currently obtainable sources of not so irradiated metals on the planet. Apparently, highly sought after for sensitive medical equipment.
As previously mentioned in this thread, human remains including bones dissolve in the sea water within a few years. Salt is not the only chemical in sea water. And heaven knows if there are tiny sea critters that can dissolve the bones to process the calcium into their own shells.
Yeah, I also don't believe much, if anything, remains of a person even after a short period in the water, let alone after decades.
To that, I personally am completely fine with the previous metioned idea from mind_messing and others: to raise the ship legally, make a memorial from an item and use the operation to make a bit of money for everyone.