science space 7932655 ----- # Longest spacewalk in International Space Station's history fails to fix fault ## An attempt to fix a fault with the International Space Station, which involved the longest ever spacewalk from the station, has failed. ![Space station][1] Doug Wheelock and Tracy Caldwell Dyson failed to fix the fault with the International Space Station Photo: REUTERS By Rebecca Lefort 11:23PM BST 07 Aug 2010 [Comments][2] Doug Wheelock and Tracy Caldwell Dyson, two American astronauts, spent just over eight hours in the void outside the space station in an effort to repair the orbiting lab's faulty cooling system, NASA said. It was the longest spacewalk in the International Space Station's history and the sixth longest ever. However the pair were unable to unbolt and remove a pump that failed last weekend. "It was a tough one as spacewalks go," an announcer from NASA's mission control in Houston, Texas, conceded on a live video feed. The pair had slept in an airlock beforehand to allow their bodies to adjust to different pressure conditions. ## Related Articles * [Stephen Hawking: only space travel can save mankind][3] 09 Aug 2010 * [Space Station astronauts remove broken coolant][4] 11 Aug 2010 * [More Twitpics from space][5] 09 Sep 2010 * [Twitpics from space][6] 17 Nov 2010 * [Nasa prepares for ISS repair job in space][7] 03 Aug 2010 * [Astronauts prepare for complex spacewalk to fix cooling system][8] 03 Aug 2010 The walk was slightly delayed because of what NASA officials described as a "communication problem" inside Caldwell Dyson's helmet, but the issue was resolved. Experts had warned ahead of the spacewalk that the operation was challenging because the astronauts would be handling ammonia lines at full operating pressure, which makes them stiff. A second spacewalk is planned for Wednesday when the astronauts will once again attempt to repair the system, [which shut down on July 31][9]. 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