NASA Commercial Crew astronauts Sunita Williams and Josh Cassada are seen lowered into the water at NASA's Neutral Buoyancy Laboratory (NBL) training facility near the Johnson Space Center in Houston, Texas, U.S., July 1, 2019. The exercises included training underwater to simulate space walks, responding to emergencies aboard the space station, and practicing docking maneuvers on a flight simulator. (Photo by Mike Blake/Reuters)
