PIX4601836 International Space Station: the European module Columbus - The International Space Station: the Columbus laboratory - European astronaut Hans Schlegel is working on the new element of the International Space Station, the European Columbus Laboratory. One of the tasks of this extravehicular outing carried out with American astronaut Rex Walheim (off-field) was to replace the nitrogen reservoir of the module. 13 February 2008. European Space Agency (ESA) astronaut Hans Schlegel, STS - 122 mission specialist, works on the new Columbus laboratory as he participates in the mission?'s second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six - hour, 45 - minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station?'s ammonia cooling system. 13 Feb. 200 by .; (add.info.: International Space Station: the European module Columbus - The International Space Station: the Columbus laboratory - European astronaut Hans Schlegel is working on the new element of the International Space Station, the European Columbus Laboratory. One of the tasks of this extravehicular outing carried out with American astronaut Rex Walheim (off-field) was to replace the nitrogen reservoir of the module. 13 February 2008. European Space Agency (ESA) astronaut Hans Schlegel, STS - 122 mission specialist, works on the new Columbus laboratory as he participates in the mission?'s second scheduled session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the six - hour, 45 - minute spacewalk, among other tasks, Schlegel and NASA astronaut Rex Walheim (out of frame), mission specialist, worked to replace a nitrogen tank used to pressurize the station?'s ammonia cooling system. 13 Feb. 200); Photo ?? NASA/ESA/Novapix; .