Joshua Kutryk simulates a spacewalk at the Neutral Buoyancy Laboratory

CSA astronaut, Joshua Kutryk, is at the Neutral Buoyancy Laboratory (NBL) pool at NASA's Johnson Space Center in Houston training for spacewalks (also called extravehicular activities, or EVAs). EVAs are one of the most difficult and dangerous tasks for astronauts working on the International Space Station.

Here he is dressed in a spacesuit while being immersed in the pool. (Credit: NASA)