After the LHC startup, there was a major malfunction, a bad electrical connection led to a 1000 amp arc of current which completely vaporized the surrounding metal. This also released the liquid helium which immediately evaporated with explosive force. 1 ton magnets were knocked off of their supports and soot filled large parts of the vacuum chamber. Hopefully everything will be put back together by next fall. The current plan is to run through next winter without a shutdown, in order to make up for lost time.
Photos taken from Roger Bailey’s talk at the Aspen Winter Conference