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The Maldives are the lowest country in the world--and getting lower, due to rising sea levels. Especially at risk is the island's reef system, the biggest in the Indian Ocean, with over 200 types of coral and thousands of tropical fish species. Witness the race to preserve this marine paradise from the ravages of climate change.

The Belize Barrier Reef is the second-largest coral reef system in the world. Estimated to be nearly 4,000 years old, its waters are home to an immense marine ecosystem. Explore a deep blue wilderness brimming with rare, exotic fish, sea turtles, sharks, and huge green morays.

Palau has set up the world's first shark sanctuary--a California-sized marine zone where hunting these endangered predators is strictly prohibited. Can this tiny island-nation defend against a sophisticated army of poachers? Join the front lines to save one of the ocean's most cherished and endangered predators.

Three hundred and seventy miles off the coast of Mexico in the eastern Pacific, the waters surrounding Socorro Island are home to some of the world's largest marine life. Take a deep dive through surging currents and majestic coral reefs with whale sharks, giant manta rays, and more.

Jacques cousteau once called cocos Island "the most beautiful island in the world." beyond its pristine rainforest is a marine wilderness brimming with multicolored fish, enormous sea turtles, and vast schools of sharks.

Forty miles north of Honduras, near the bay Island of Roatan, is a spectacular and pristine preserved coral atoll: the Mesoamerican reef. explore the abundant and diverse marine life, lush vegetation, and magnificent caves of this rare underwater wonder.