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Japan's waters are home to the largest diversity of shark species on the planet, most of which take otherworldly forms. Wildlife biologist Forrest Galante, along with deep-sea marine scientist Christina de Silva and deep-water surveyors, track down and study these alien sharks in their mission to uncover whether the critically endangered Angel Shark remains in Japan's waters . Along the way, Forrest will uncover 17 different and unique species and witness the births of little-known Velvet Dogfish sharks.