Parmitano's partner, NASA astronaut Chris Cassidy, comes over to see if he can figure out the cause of the leak.
"At first, we're both convinced that it must be drinking water from my flask that has leaked out through the straw, or else it's sweat. But I think the liquid is too cold to be sweat, and more importantly, I can feel it increasing. I can't see any liquid coming out of the drinking water valve either," Parmitano wrote.
NEWS: Spacewalk Aborted When Water Fills Astronaut's Helmet
NASA decides to call off the spacewalk, which had been under way for only about an hour, and tells Parmitano to go back to the airlock.
But the astronaut's troubles are just beginning.
"As I move back along my route towards the airlock, I become more and more certain that the water is increasing. I feel it covering the sponge on my earphones and I wonder whether I'll lose audio contact. The water has also almost completely covered the front of my visor, sticking to it and obscuring my vision," he wrote.
He turns upside-down to get past an antenna and catches sight of a sunset. Then, "my ability to see - already compromised by the water - completely vanishes, making my eyes useless; but worse than that, the water covers my nose - a really awful sensation that I make worse by my vain attempts to move the water by shaking my head," Parmitano wrote.