BREAKING from Bill Harwood of on Zombie Twitter:

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ISS: In the last few minutes, MCC-Houston asked the ISS crew to go to the cupola and look for any signs of "flakes" toward the aft of station; Jasmin Moghbeli reported "yeah, there's a leak coming from the radiator on MLM;" the MLM is the Russian Nauka multi-purpose lab module

Harwood then tweets:

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ISS: Andreas Mogensen reports he's taken photos and sent them to the ground; no other information yet; the Russians suffered two recent coolant leaks, one on a Soyuz and another on a Progress cargo ship

This 2021 map shows you the relative locations of Nauka (Russian for science) and the cupola (viewport).

From @SpaceflightNow on Zombie Twitter:

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A leak from a radiator on the Russian Nauka laboratory module has been confirmed by the space station crew. NASA mission control has asked for the station's window shutters to be closed. You can listen to live audio in our Launch Pad Live Stream:

From Bill Harwood on Zombie Twitter:

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ISS: There are believed to be two radiators on the Nauka lab module, including one launched years ago with the Rassvet module and installed earlier this year during a Russian EVA; leak origin not yet known

ISS: MCC to Mogensen: "We're still assessing with Moscow. Right now there are no impacts, still working to fully understand this one"

Live station audio with an external view (not of the leak) streaming live on the NASA YouTube channel:

youtube.com/watch?v=1rcSyN74BY

I've heard a couple "caution and warnings" on the space to ground between station and Houston, but both times Mission Control nothing to worry about, "we're looking at it."

The space to ground audio has been quiet, but the station has many different means of communication with the ground, and not just to Houston. There are mission controls at Star City outside Moscow, ESA's in Oberpfaffenhofen, Germany, and Tsukuba, Japan.

They even have ham radio!

From Bill Harwood of on Zombie Twitter:

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ISS: Roscosmos says via Telegram "a coolant leak occurred from the external (backup) radiator circuit, which was delivered to the station in 2012;" it says Nauka's main coolant loop is operating normally and "the crew and the station are not in any danger"

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I'm going to secure from red alert unless circumstances change.

@HopeSeeker Thank you. I'm glad it's nothing serious. The last time the Russians had a leak, their propaganda falsely claimed a female NASA astronaut had committed an act of sabotage. (Roscosmos blamed space debris.)

NASA has two female flight engineers aboard now. When I heard about the leak, that's the first thing I thought. "Uh oh, here we go again ..."

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