In the past, when parts of the accelerators have been upgraded or added to, engineers would often additionally replace the cables that connected them. In the process, they would leave in place the old cables that were no longer in use. Now, a heap of obsolete cables are blocking the way to install new ones needed for the accelerator?s next big upgrade. To make space, CERN engineers have set out to identify and remove the old, unused cables. All 9,000 of them.

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