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Aaron Alexis was profoundly psychotic when he hunted employees in a U.S. Naval Office in 2013.

He was armed with a shotgun and a clearance to handle military secrets.

He was able to exploit his position of trust and gain access to building where he murdered his colleagues, 12 of his colleagues, others wounded.

How could someone like Aaron Alexis be granted a U.S. government's security clearance?

That's our story tonight.

Security is tight at the Large Hadron Collider.

You need a retina scan to get inside. Thank you. You have been identified.

Power, cooling.

The entire complex is buried deep underground.

This is the detector right here.

It's believed to be the largest and most complex machine mankind has ever created.

The things it's searching for sound like they're straight out of science fiction.

Oh, no, really?

I'm past patiently waiting.

I'm bashing at least smashing.

Every expectation

Every action is an act of creation

...