Underwater explorer and photographer Jill Heinerth has dived into unmapped caves deep in the earth, and beneath a giant iceberg. She's seen hidden creatures old as dinosaurs, and witnessed scenes of surreal beauty. Her work is so dangerous, over a hundred of her friends and colleagues have died in caves. She talks about the risks and rewards of her work.
Explorer and environmentalist Jean-Michel Cousteau. The son of famed oceanographer Jacques Cousteau, Jean-Michel has spent much of his life aboard their ship, "Calypso," traveling the world and learning about its wonders and peoples. Jean-Michel is now director of expeditions for the Cousteau Society, and he led the Society's recent voyage to Papua New Guinea. His logbook from that expedition has just been published, and the trip will also be featured as the first episode of a new T-V series, "Cousteau's Rediscovery of the World."