Tim Peake's first spacewalk may have been terminated early, but it was still a huge success.
He and NASA crew-mate Tim Kopra ventured to the very edge of the space station to carry out a repair by torchlight.
And they did it ahead of schedule, restoring the ISS to full power.
I watched his progress with the people who trained him at the European Astronaut Centre in Cologne.
Herve Stevenin was in charge of Major Peake's spacewalk training in the centre’s deep water pool, which mimics the effects of working while weightless.
He told me the Briton's performance had been impressive.
But there was a change in mood when the NASA astronaut reported water in his helmet.
Italian astronaut Luca Parmitano was also watching the spacewalk.
He nearly drowned during a spacewalk three years ago - while wearing the same suit.
Since his close call, mission control have changed their procedures and the decision was taken at an early stage to terminate and bring the two Tims back inside.
Luca stressed to me that this wasn't an emergency.
The astronauts had time to secure the cables they had been working on and make a controlled return to the airlock.
There was only 15ml of water inside Tim’s helmet.
But the fact that the same suit has leaked twice will be a concern.
The ISS crew took dozens of photos of the water to help ground control work out what went wrong.
And it just goes to show that however well they rehearse for a spacewalk they are still unpredictable - and the hazards of working in the void of space are very real.
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