MikeB4:There are many places where the souls who have perished are left where they perished. The many warships and merchant marine ships from the two world wars are an example the oceans are their field of honour. The USS Arizona in Pearl Harbour still has the remains of lost sailors sealed in her hull. There is a permanent memorial above. The mine should be sealed and the site become a permanent memorial and the ground tapu.
It is different during times of war, as it would be unsafe to retrieve them, as the risk of the retrieval also getting bombed would be very high. Also it was a very different time back then. But during modern war, such as the USA in the Middle East, they alway seem to bring the bodies of the dead soldiers back to the USA, where they can. That wouldn't be cheap to do, but obviously the families wouldn't be happy if they didn't.