Webwe’ll delve into underwater mountains, hydrothermal vents, and vast underwater canyons, discovering the geological marvels that shape the ocean floor. Webnpr's a martinez speaks with scuba diver and writer susan casey about her new book, the underworld: Journeys to the depths of the ocean. Webdeep sea diving allows us to embark on a journey into this alien world, uncovering its secrets and unlocking the wonders it holds. In this article, we will delve.