ESA astronaut Andreas Mogensen about to head underwater for spacewalk training at NASA’s Neutral Buoyancy Lab in Houston, USA. As the spacesuit is too heavy for moving around on dry land, astronauts are lowered into the pool by crane.
Training underwater on a life-size mockup of the Space Station is one way astronauts prepare for their mission. Floating underwater is one of the best ways train on Earth for weightlessness.