ESA astronaut Andreas Mogensen's latest update on training for his mission to the International Space Station in 2015. Andreas is joined by ESA astronaut Luca Parmitano as they observe activities in NASA's Neutral Buoyancy Lab (NBL), a giant swimming pool at Johnson Space Center in Houston. The NBL contains submerged full-sized mockups of ISS modules and is used to train for spacewalks on the real thing.