This undated file image obtained 02 July, 2003 courtesy of the National Oceanic and Atmospheric Administration (NOAA) and the University of North Carolina-Wilmington shows the Aquarius underwater habitat. NASA, the (NOAA) and the University of National Undersea Research Center at the University of North Carolina at Wilmington (UNCW), are conducting astronaut training on Aquarius located off the coast of Key Largo, Florida. The NASA Extreme Environment Mission Operations (NEEMO) program is designed to prepare astronauts for the physical and mental demands of working in space. AFP PHOTO/ NOAA / UNC Wilmington (Photo by NASA / NASA / AFP) (Photo by NASA/NASA/AFP via Getty Images)Photo: NASA / AFP / Getty Images