In a time before time, when the oceans were still young and mysterious, a terror lurked in the darkness. The Megalodon, a shark of unimaginable size and power, ruled the seas with an iron fin.

This behemoth of the deep reached lengths of up to 60 feet, its body a sleek and streamlined torpedo, built for speed and destruction. Its jaws, wide enough to swallow a school bus, were lined with razor-sharp teeth, each one a deadly triangle of...