Of those 900, only 321 survived. To this day it is considered to be the worst naval disaster in US history. The fact that the ship was sunk in waters filled with sharks is often perceived as the main reason for such great loss of men. Among those, the Oceanic whitetip sharks were the most numerous. However, most deaths can be contributed to lack of drinking water and food (help arrived on the fourth day) and the exposure to the elements. [links]