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.

Researchers hope to prove reef squid speak to each other with a language they paint on their skin; egg-laying rituals of reef squid; largest octopus.

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.