The oceans remain a realm of mystery, with an astonishing 95% still unmapped, but their secrets are starting to be revealed. Journey into the deep to explore exciting discoveries like sea sponges with cancer-fighting potential and underwater mountain ranges that may hold the clue to life’s origin. ABC News’ Bill Weir moderates a discussion with marine biologist Sylvia Earle, oceanographer David Gallo and Fabien Cousteau. Rare footage of pioneer Jacques Cousteau will take us back to the early days of passionate ocean exploration; the premiere of “behind-the-scenes” footage from Jacques Perrin’s new film Oceans will inspire with a vision of what lies ahead.