A burst of pressure from escaping helium damaged the Large Hadron Collider’s magnets – click the link in the main text, left, to see more images.
In September, in a circular 27-kilometre tunnel beneath the Swiss-French border, the most complex machine ever built was switched on.
Riding on the Large Hadron Collider were the hopes of hundreds of excited physicists, who hoped that by colliding proton beams at near light speed it would reveal new particles and solve old mysteries. Yet after just nine days of operation, an accident closed the LHC down.
See images showing the damage caused, and learn more about what happened.
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