29 July 2013 --- ESA astronaut Luca Parmitano, Expedition 36 flight engineer, performs maintenance on the Water Pump Assembly 2 / Thermal Control System (WPA2/TCS) in the Columbus laboratory of the International Space Station. The pump was delivered to space via ATV-4. Credit: ESA/NASA

29 July 2013 — ESA astronaut Luca Parmitano, Expedition 36 flight engineer, performs maintenance on the Water Pump Assembly 2 / Thermal Control System (WPA2/TCS) in the Columbus laboratory of the International Space Station. The pump was delivered to space via ATV-4. Credit: ESA/NASA