Divers test the limits of shark and human interaction with lemon, bull and white sharks; a feeding frenzy of more than 100 reef sharks in the Bahamas.

The remote and barren Socorro Islands offer little refuge to humans, but they are a magnet to migrating fish, whales and large sharks. This program focuses on the archipelago's most intriguing residents, giant manta rays, their unusual behavior and surprising intelligence.

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.

The waters of Papua, New Guinea and Australia's Great Barrier Reef are among the richest on Earth. Harbouring an exceptional variety of venomous fish, reptiles and invertebrates, their coral reefs conceal frightening secrets. The poisons of these animals are some of the most lethal known to man, but they also hold enormous potential in the development of new medicines.