Age of the cyber spy
The operation, masterminded by the countrys elite Revolutionary Guard, includes the construction of a high-tech spying post close to the point where Iranian forces kidnapped 15 British naval personnel in March.
The move has forced British and American commanders to divert resources away from protecting oil platforms in the Gulf from terrorist attack and into countering the new Iranian threat.
The US military says that the spying post, build on the foundations of a crane platform sunk during the Iran-Iraq war, is equipped with radar, cameras and forward facing infra-red devices to track the movement of coalition naval forces and commercial shipping in the northern Gulf.
Commanders fear that one of the main purposes of the Iranian operation is to enable the Revolutionary Guard to intercept more coalition vessels moving through the disputed waters near the mouth of the Shatt al Arab waterway south of the Iraqi city of Basra.
The disastrous British handling of the hostage crisis has convinced some in the Iranian regime that there is mileage in further such attempts.
But the US military believes the listening post could also be used to help Iranian forces target commercial shipping in response to any US air strikes on its nuclear facilities.
Such operations would form part of their threat to launch guerrilla or asymmetric attacks on western interests if Iran is attacked.