Host Neil deGrasse Tyson features his interviews with legendary oceanographer Sylvia Earle and famed aquanaut Fabien Cousteau. Tyson is joined in the Hall of the Universe by comedian co-host Scott Adsit and guest marine biologist and conservationist Laure Katz to discuss ocean exploration and conservation. Adding to the discussion, actor and activist Adrian Grenier joins via video and Erika Bergman shows off her submarine.