This nature series takes you beneath the surface of the ocean and into some of the greatest aquatic environments of the world. Discover mysterious marine locales and remarkable coral formations. Visit the exquisite Galapagos Islands and learn how this rich ecosystem is under attack. Enter an extensive system of underground caves in Acumel. And explore the Canadian government's efforts to develop an ambitious artificial reef project. With breath-taking underwater photography, this series reveals the many facets of this dangerous and fascinating kingdom.