The deep ocean environment is the most extensive on our planet. Its denizens are normally unseen but whenever they are exposed to view they are regarded as bizarre aliens from a different world. The Biology of the Deep Ocean takes a close look at this apparently hostile world and explains how its inhabitants are exquisitely adapted to survive and flourish within it. Describes the largest ecosystem on the planet. Deals with the hidden 'aliens' of Earth's inner space. Includes all oceanic organisms, from viruses to whales. Highlights the extraordinary survival strategies of the deep-sea fauna. Founded on the author's unique deep-sea experience in all the world's oceans, based on more than 60 research cruises and submersible dives. The Biology of the Deep Ocean complements the two companion volumes on the biology of the littoral and estuarine habitats and is designed to be accessible to all marine scientists, student and professional.