Ornella Weideli returns to Shark Week with Dr. Tristan Guttridge to find out why sharks come together at various times of the year and in different locations around the world to socialize, hunt, swarm, and spiral.

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.