By: malterwitty

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Three members of the ISS crew were woken in the middle of the night on Monday by ground control to search for the leak's source - as it appeared to be growing rapidly.

They shut compartment hatches one by one and used an ultrasonic leak detector to collect data - eventually pinpointing the leak to the Zvezda Service Module.

The exact location of the leak within the Russian module still hasn't been found - but NASA says it hadn't really grown in size and poses no risk to the crew.

The Zvezda module is a key part of the Russian half of the station as it provides the segment with oxygen and drinkable water.

It also houses CO2 scrubbers and has the sleeping quarters, bathroom and dining room for the Russian cosmonauts.