Spacewalk Terror: When Water Floods Your Helmet [Video]

This exclusive video shows what happened when water began covering the head of an astronaut on a spacewalk.

Everything began as normal on July 16, 2013, when Italian astronaut Luca Parmitano and American Chris Cassidy set out for a routine spacewalk. But then something went wrong.

"I feel a lot of water on the back of my head," Parmitano told Mission Control.

"Are you sweating? Are you working hard?"

"I am sweating, but it feels like a lot of water..." Parmitano continued. The water did not let up, and began coating his head and approaching his nose and mouth. For a man in serious danger, he sounds very calm, as you can see in this video. I won't spoil it for you--go ahead and take a look. It's an excerpt from the show "Live From Space," which premieres at 8 p.m. ET / 5 p.m. PT on Friday, March 14, on The National Geographic Channel.

To find out how the leak happened, which NASA said was "probably the most serious [spacewalk incident] that we've encountered," check out this Popular Science story.

Video credit: NASA/Arrow Media