The Iranian security staff are going to experience what leaving no stone unturned is really like.
"A MONITORING device disguised as a rock has been found near an underground Iranian nuclear enrichment plant.
Western intelligence sources told The Sunday Times the device exploded when it was disturbed by Iranian troops.
Revolutionary Guards were on a patrol checking data and telephone links at Fordo, near Qom in northern Iran.
They tried to move the rock, setting off its self-destruct mechanism.
But experts examined the rubble and found a device designed to intercept data from computers at the plant.
The accident signals the loss of an important source of intelligence for the West on Iran's progress towards making a nuclear bomb."