A sign of a leakyvalve on the International Space Station held up Russian cosmonauts for nearly an hour Monday, as flight controllers sought to isolate the suspected leak.

A suspected leaky valve on the International Space Station stalled the start of a spacewalk by Russian cosmonauts for nearly an hour today (Aug. 20), forcing them to wait in bulky spacesuits until it was deemed safe to venture outside.

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Veteran cosmonauts Gennady Padalka and Yuri Malenchenko were preparing to begin theirspace station spacewalkwhen the leak was detected during air pressure tests. Russian flight controllers at the station's Mission Control Center in Moscow asked the cosmonauts to stay put until the leaky valve could be isolated.

Padalka, the space station's commander, agreed.

"We're in no rush," Padalka radioed Mission Control in Russian, which was translated in a NASA broadcast.

Flight controllers spent almost an hour trying to isolate the leaky valve and monitoring air pressure inside the station's airlock and adjoining modules. Ultimately, they radioed good news to the spacewalkers the leak was resolved and it was safe to proceed. It was welcome news for the cosmonauts.

"We're just hanging here and it's kind of boring," Padalka said.

At 11:37 a.m. EDT (1337 GMT) nearly an hour latethe two cosmonauts finally opened the space station's airlock hatch and prepared to get to work.

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Leaky valve on space station delays spacewalk (+video)