Mysteries of the Sea

12 underwater photographic essays on marine life - from the stunning opening footage of sharks off South Australia, to the Arctic Ocean beneath the ice cap, to oyster farms off Tahiti. Endin... Read all12 underwater photographic essays on marine life - from the stunning opening footage of sharks off South Australia, to the Arctic Ocean beneath the ice cap, to oyster farms off Tahiti. Ending the program, marine botanist Sylvia Earle plants an American flag on the ocean floor, 12... Read all12 underwater photographic essays on marine life - from the stunning opening footage of sharks off South Australia, to the Arctic Ocean beneath the ice cap, to oyster farms off Tahiti. Ending the program, marine botanist Sylvia Earle plants an American flag on the ocean floor, 1260 feet below sea level - then the deepest solo dive in history.