Hunting for Hezbollah Thursday 31 May 2007 1900 BST on BBC Two Programme preview

"This World" provides an exclusive insight into Hezbollah - the powerful political and military organisation of Shia Muslims in Lebanon - and investigates whether Hezbollah are gearing up for another war.

In his State of the Union address, George Bush said Hezbollah was one of the most dangerous terrorist organisations in the world.

So This World hits the ground in Beirut, seeking out the "Party of God".

It is a year since the Iranian backed militants claimed victory in a bloody 33 day conflict with Israel.

"This World" investigates claims that Hezbollah are back, more powerful than ever and readying themselves for another war.

Perfect bridge

Just after we arrived in Beirut, Hezbollah's Press Office put a blanket ban on all filming activity. So this is the film they did not want you to see.

Dawoud Indahoud is a former Shia militiaman

Our guide through Hezbollah-land is Dawoud Indahoud- a wise-cracking former Shia militiaman with all the right connections to the city's darkly vibrant underbelly.

He is a Hezbollah voter, but is not officially a member of the organisation.

Having lived in the US for 18 years he understands the West, but in his heart he is a loyal Shia Muslim.

Dawoud is the perfect bridge between our world and theirs.

Inside a secret bunker

Secret network

This World investigates how Hezbollah uses Iranian money to win the battle for hearts and minds: rebuilding houses through their Construction Jihad organisation.

Guided by Dawoud, This World meets the martyr's mother - the most hardcore Hezbollah supporter Dawoud has ever met - talks to arms dealers, and finds a new mountain stronghold.

They also discover a secret Hezbollah bunker network with electricity, running water and steel walls 100 metres underground.

Hezbollah MPs and leaders say that they are ready and waiting for the next war.