Changing SeasSeason 62014 · 4 episodesEpisodes1Living FossilsCrinoids have been around in various forms since before the age of dinosaurs. Now experts descend into the deep to study the animals from a submersible.2Biggest Fish in the SeaEach summer, the world's largest known aggregation of whale sharks occurs just off the coast of Cancun, Mexico, giving experts the opportunity to learn more about the largest fish in the sea.3Galápagos: Windows into the FutureThe unique oceanic conditions of the Galápagos Islands serve as a perfect natural laboratory to study how climate change may impact corals in the future.4Saving SawfishStrange and prehistoric-looking, Smalltooth Sawfish were once coveted by anglers as popular trophy fish. But habitat loss and overfishing have greatly reduced the animals' range and landed them on the endangered species list in 2003.Season 1Season 2Season 3Season 4Season 5Season 7Season 8Season 9Season 10Season 11Season 12Season 13Season 14Season 15Season 16Season 17Season 18
