Hydrolab Being Moved into National Museum of Natural History, by Clark, Chip, 1986, Smithsonian Archives - History Div, Hydrolab, the National Oceanic and Atmospheric Administration's underwater research habitat, arriving at the National Museum of Natural History in early March, 1986. The 18-foot long, 8-foot high tank-like habitat is for display in the museum's Sea Life Hall. It is the largest man-made object ever transported to the museum for an exhibition..