Pulitzer Prize winner William J. Broad takes us on an adventure to the planet's last and most exotic frontier -- the depths of the sea. The Universe Below examines how we are illuminating its dark recesses as a wave of advanced technology quietly opens the Earth's largest and most mysterious environment. Broad takes us on breathtaking dives and expeditions -- to the Azores, to the Titanic, to hot springs teeming with bizarre life, to icy fissures aswarm with gulper eels, vampire squids, and gelatinous beasts longer than a city bus. We meet legendary explorers and researchers and go with them as they probe the ancient mysteries of a universe that encompasses the vast majority of the Earth's habitable space and holds millions of humanity's lost artworks and treasures. The Universe Below is an unforgettable trip to our last great unexplored frontier.