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About the Show
National Geographic Ocean Explorer Enric Sala and his team are on a mission: Dive the protected waters of Cocos National Park off the western coast of mainland Costa Rica; be the first to dive the mysterious Las Gamelas seamounts; and to free sharks, turtles and tunas caught on illegal fishing lines. It's all part of an effort to understand how over-fishing affects shark populations - and what happens to eco-systems when the sharks disappear. The puzzle: using submarines, shark tags, and satellite technology, find the elusive "shark superhighway" in the Eastern Pacific where the predator has become prey.

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