Forensic analysis of 17th Century human remains prove that the earliest settlers resorted to cannibalism, they say.

Most have resorted to cannibalism.

Further west in the Sierra Nevada the Donner Party had become snowbound and had resorted to cannibalism to stay alive.

"Well, we've got two weeks before we need to resort to cannibalism," Hoffman said.

The weather conditions claimed some, and the sixteen who survived resorted to cannibalism to stay alive, and inspired the movie and book, Alive.