Later ,the NASA officials clarified that a computer problem probably created the false impression of leaking coolant. The Russian Space Agency emphasized that the crew members of the International Space Station had not been in danger. Mission control experts in Russia and the US quickly co-operated to ensure the crew’s safety.
As alarms rang out, the six crew members on the outpost put on breathing equipment and moved into the Russian segment after the alert at around 0900 GMT and sealed the hatch to the US side behind them.
At the same time, flight controllers at NASA’s Johnson Space Center in Houston turned off non-essential equipment.Within minutes, mission control gave an all-clear, but sent the astronauts scurrying back to the Russian side again when there was more evidence of a possible leak.
The highly toxic liquid ammonia which is an excellent coolant is used to cool electronics. Flight controllers originally feared it had entered the water system running inside the station but now it’s believed that a failed card in a computer-relay box set off the alarm.
The outpost is manned by NASA astronauts Barry Wilmore and Terry Virts, cosmonauts Elena Serova, Alexander Samoukutyaev and Anton Shkaplerov and European Space Agency astronaut Samantha Cristoforetti.