In the tense final hours before Nasa's astronauts flew into space, a series of technical issues threatened to ground their landmark mission.
A faulty toilet and issues involving two safety systems were reported over the radio.
Nasa managed to resolve the problems by being "quick on their feet", an official later said.
The Artemis II crew are now hurtling around the Earth's orbit, carrying out final tests and checks before they head towards the Moon.
Here's what nearly went wrong - and what still could.
