Pretty scary stuff.

An Italian astronaut has described his fear as water began filling his helmet during a spacewalk and he only just made it back into the International Space Station (ISS).

In a blog post Luca Parmitano said water was sloshing around, getting into his eyes and ears.

His spacewalk on 16 July with partner Christopher Cassidy was aborted once mission control heard about the leak.

Barely able to see, he used his safety cable to get back to the airlock.

"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," he wrote.