A game-changing fish pits the young crew on the Rasta Rocket against the fleet's veterans.

Spain’s attempted conquest of England fails when the Armada is defeated. By draining the ocean, we reveal how the English then stole ship technology to build their own empire.

An already volatile situation inside the infected research facility boils to a head. Jaax ultimately must face the ramifications of trying to balance her dangerous career and her loving family.

Jack Randall dives in to help green sea turtles survive Australia’s Great Barrier Reef.

A 600-pound manatee named Agua is released back into the wild after years at the zoo.

Go beyond The Hot Zone to see the incredible real-life stories of those on the frontlines fighting against one of the world’s most deadly viruses.

Phil Keoghan helps tag bears in Maine. Correspondents investigate the Nasca lines in Peru, Viking giants in Iceland and the future of farming.