It was the first time in years that a spacewalk came to such an abrupt halt and the first time since NASA's Gemini program in the mid-1960s that a spacewalker became so incapacitated. Spacewalking always carries high risk; a puncture by a micrometeorite or sharp edge, if big enough, could result in instant death.
In a late afternoon news conference, NASA acknowledged the perilous situation that Parmitano had found himself in, and space station operations manager Kenneth Todd promised to "turn over every rock" to make sure it never happens again.
"He did a great job of just keeping calm and cool" as the amount of water ominously increased said flight director David Korth.
The two astronauts were outside barely an hour, performing routine cable work on their second spacewalk in eight days, when Parmitano reported the leak. It progressively worsened as the minutes ticked by, drenching the back of his head, then his eyes, nose and, finally, mouth. He could have choked or drowned on the floating globs of water, NASA officials acknowledged.
Between 1 and 1½ liters of water leaked into his helmet and suit, NASA estimated.
The source of the leak was not immediately known, but the main culprit appeared to be water that is piped through the long underwear worn under a spacesuit, for cooling. The system holds nearly 4 liters, or 1 gallon. Less likely was the 32-ounce (about 1 liter) drink bag that astronauts sip from during lengthy spacewalks; Parmitano reported the leaking water tasted odd.
Cassidy told Mission Control: "To him, the water clearly did not taste like our normal drinking water." A smiling Parmitano then chimed in: "Just so you know, I'm alive and I can answer those questions, too."
O Find more about the NASA mission • http://www.nasa.gov/missionpages/station/main/index.html