The Large Hadron Collider, one of the world’s most complex and expensive science experiments, will soon be switched back on.
 
The collider was taken offline for an upgrade that cost $165m.
 
It's been two years since the collider was used to discover the Higgs Boson particle, which scientists believe turns energy into mass.

Al Jazeera's Tarek Bazley reports from deep beneath the border between Switzerland and France.

Source: Al Jazeera