A spectacular sea adventure produced by National Geographic. Dive in and follow a curious dolichorhynchops –'Dolly' – as she travels through perilous oceans and encounters long-necked plesiosaurs, giant turtles, enormous fish, sharks, and the most dangerous sea monster of all, the mosasaur.

Accompany fossil hunters on an unforgettable journey to remote locations as they excavate the remains of some of the most fearsome creatures of all time.