Corrected entry: Accounting for the forty year time period, and the amount it takes the human body to decompose, there should be some signs of human remains. The only thing Epps finds is the skeleton of Katie. All of the people in the pool, on the deck, and everywhere else, should have left skeletal remains at least. But there aren't any, save for Katie's.
Phixius
8th Nov 2013
Correction: Because those people were collected, body and soul, by the evil spirits on the ship. Katie was not so her body remained. Her soul, though trapped on the ship, was also free to warn the newcomers.
Phixius ★