The past year has seen the tension rise in the corridors of the nuclear watchdog of the United Nations - the International Atomic Energy Agency (IAEA).
The IAEA's role has been put under unprecedented pressure by Iran
Its role to police the Nuclear Non-Proliferation Treaty (NPT) has been put under unprecedented pressure by Iran and its determination to have its own nuclear programme.
A BBC Radio 4 two-part documentary charted a critical time for the UN as concern grows about the spread of nuclear weapons.
BBC Reporter and former Berlin correspondent, Rob Broomby had unique access over the past year to main players in this game of international nuclear brinksmanship.
From the meeting rooms of the IAEA Headquarters in Vienna to the dusty plains of Kazakhstan, he was allowed to witness the work of the agency at a time when the stakes have never been higher.
The journalist was also given a privileged insight into the nerve centre of the IAEA's laboratories that monitor the world's nuclear facilities and has spent considerable time with nuclear inspectors, travelling with them to Georgia and Kazakhstan.
Over the two programmes the work of the IAEA was explored as a developing crisis unfolds between Iran and the West over the nuclear issue.
Inside the IAEA: A year with the nuclear detectives was broadcast on BBC Radio 4 at 2000 BST on Thursday 31 May 2007 and 7 June 2007.