We explore a world mankind knows so little about—our oceans. We meet the inventor of the ExoSuit, the "Iron Man" of the sea, that's allowing divers, scientists and even archaeologists to explore the sea like never before. We speak with a true heroine of the ocean, Sylvia Earle, about her 50-year career beneath the waves and explore her latest mission: to take mankind to the deepest, darkest depths of the ocean floor. We then round-up all the latest science news that you need to know.