The Blue Realm

Relive the events that led to the attack that almost killed Dr. Ritter. Witness a feeding frenzy of over 100 reef sharks in the Bahamas, and see a diver literally ride a great white shark in Gansbai, South Africa!

Manta rays in the Socorro Islands off Mexico's Pacific coast; Bubbles, a 15-foot manta in the Bahamas.

Do squid and octopus talk with their skin? This program joins scientists in a remarkable quest to unravel the secrets of one of the sea's most enigmatic creatures, cephalopods. The episode features the bizarre behavior and sexual rituals of Caribbean reef squid, giant octopus of the Pacific Northwest and cuttlefish at the National Resource Center for Cephalopods in Galveston, Texas.

Sea snakes; a small cone snail hunts, paralyses and eats its prey; therapeutic medicines can be made from the venom of fish and invertebrates.

Whale sharks can reach nearly 50 feet in length and weigh 30 tons or more; the capture and transport of whale sharks to the Georgia Aquarium in Atlanta.

Humpback whales may be in danger again as whaling nations explore new ways to re-open the hunt.