Diver Down: ESA astronaut Thomas Pesquet EVA Training

With lights blazing dramatically from his chest, ESA astronaut Thomas Pesquet descends underwater during spacewalk training at NASA's Neutral Buoyancy Lab in Houston, TX. 

Training and support divers stand by, monitoring his movements. 

Astronauts use underwater training on a life-size mockup of the space station as one way to prepare for their mission. 

Floating underwater represents one of the best ways to train on Earth for weightlessness. 

Credit: ESA/NASA