Luke Tipple returns to Shark Week with his team to unravel the mystery behind one of the strangest creatures, the sawfish. They set out on the most dangerous dive to help bring this rare creature back from the brink of extinction.

A review of the greatest moments from Shark Week 2017, including the close calls, big bites, great gadgets, and viewers' top picks.

Multi-time Olympic gold medalist Michael Phelps meets Doc Gruber and Tristan Gutteridge from the Bimini shark lab to learn everything there is to know about sharks.