I think we are underestimating what a fantastic machine the human body is. It can endure a lot. What about those poor students on that Japanese trawler that was broken in two by the sub? They were able to recover the bodies long long after the accident. And they were not bones either but actual corpses. And that was in deep water too. I know of many times where bodies have been recovered from the sea and were still reconizable. But to be fair Humans decompose at differing rates. I have seen photographs of some of Titanic's dead and the particular photos showed a body in what I thought was a pretty good shape. He was missing an eye and part of his face had a slight leatherly appearence to it but overall his was in fair condition.