"I could see the ice crystals were flowing out there, and then, just like a snow machine, there was ice forming at that port on the SCU," Dyson told Mission Control. The SCU is designed to connect to the ISS airlock as astronauts are in the hatch preparing for the final stages of disconnecting for the EVA. They were still in the hatch when the leak happened, with the external door open, but closed it moments after the spacewalk was terminated. "It was a pretty impressive snowstorm," astronaut Butch Wilmore said during NASA's livestream.
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