Enjoy this fascinating tour of the National Museum of Natural History's Sant Ocean Hall with the Sant Curator, Dr. Nancy Knowlton, author of National Geographic's "Citizens of the Sea".  The ocean is a global system essential to all life-including yours! By visiting the ocean hall, you can explore the ocean from the sunlit surface to the darkest depths, from prehistory to today, and from the smallest microorganisms to the biggest animals ever known. The ocean is a huge, awesome realm - sometimes mysterious but always amazing. Despite its importance, the ocean remains largely unexplored. Come and dive in. Discover the ocean and be one of the first to observe what goes on  in the museum's newest hall!   Tour also includes a "behind-the-scene" visit to the museum's collections.