Large Hadron Collider

The  was a device built by CERN beneath France and Switzerland to find the Higgs particle. It collided protons in a circular tunnel with a circumference of 27 miles. After a test lasting a few nanoseconds, it let out some neutron eaters. When the collider started up properly, Professor Johnson and Jack Harkness had protons and anti-protons fired upon one another to cancel each other out. This closed the portal to the neutron eaters' dimension and the Higgs particle was created as a side-effect. (BBCR: Lost Souls)