Engineers have begun a major upgrade of the Large Hadron Collider (LHC).
Their work should double the energy of what’s already the most powerful particle accelerator in the world.
BBC News is the first to be allowed to see inside the LHC – on the French-Swiss border – to watch the work being carried out.
Scientists believe the upgrade will enable them to discover new particles which will lead to a more complete theory of how the Universe works.
A project leader with the LHC’s …