New secret nuclear facility in Iran???

This is from the Jerusalem Post...

An Iranian resistance group claimed Thursday that Iran is constructing a secret, new underground military nuclear facility near its Natanz uranium enrichment plant.

The claim, made by the National Council of Resistance of Iran at a Paris news conference, could not be independently verified. The group said it has passed its information, which it said came from sources inside Iran, to the International Atomic Energy Agency in Vienna, Austria, but has so far not received a response.

The opposition group claimed that the site is 5 kilometers (3 miles) south of the Natanz plant, located under a mountain called Siah Kooh, which it said would help protect it from any air strike. It said the site includes two tunnels with entrances 6 meters (20 feet) in diameter and that a third tunnel links the alleged facility to Natanz.