"Carcharodon megalodon -- apex predator of all time, the most fearsome creatures that ever lived -- a 70-foot, 60,000 pound Great White Shark. Hundreds of 7-inch serrated teeth filled jaws that could swallow an elephant whole. It could sense its prey miles away, inhaling its scent as it registered the beat of its fluttering heart, and if you ever came close enough to see the monster ... it was already too late. For Navy deep-sea submersible pilot...