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February 2003, Nuttons, Iran.

UN weapons inspector Oli Hayannan watches through the window as his car rumbles down a remote dirt road towards a cluster of concrete buildings.

He and his team work for the International Atomic Energy Agency, the watchdog charged with containing the spread of nuclear weapons. They're here following a tip-off that this facility

is enriching uranium as part of Iran's secret weapons program. Heenan is keeping an open mind.

The tip came from a group opposed to Iran's theocratic regime.

It has every incentive to exaggerate its claims.

It might even have been fed information by foreign intelligence agencies

who also want change in Iran.

But as they get closer, he sees anti-aircraft missile batteries guarding the site,

and that sets alarm bells ringing.

An Iranian guide leads them inside, down a corridor lined with photographs and diagrams

for advanced centrifuges.

It is designed to impress Iranian dignitaries and show them their money as being well spent.

Then they enter a vast room where more than 160 centrifuges are spinning at speed and ranged in parallel cascades. The lines run far into the distance,

and the space is big enough to house a thousand centrifuges. Ainen takes a deep breath. The opposition group was right.

His mission now is not to find out if Iran has a nuclear weapons program, but how it advanced so far.

He turns to the guide. This is an impressive facility.

When did construction start? Who helped you build it?

About five years ago? We built it ourselves. There is information on the Internet.

This is highly advanced technology.

...