Against all odds, life has sprung up in nearly every corner of our planet. Ocean trenches may be inhospitable to humans, but resilient sea creatures have adapted to the intense darkness and crushing pressure at the bottom of the ocean. Young readers explore the groundbreaking technologies used to explore these underwater worlds, the unique life-forms that defy the odds, and the geological forces that have shaped these extreme habitats. Stunning full-color photographs and informative graphic organizers reveal the hidden wonders of some of Earth's most extreme and unexplored places.