Iran reinforcing underground nuclear site, report says citing satellite images

High-resolution satellite imagery shows Iran is reinforcing tunnel entrances at a major underground facility at Kolang-Gaz La Mountain, also known as “Pickaxe Mountain,” the Institute for Science and International Security reported.

The imagery, dated February 10, indicates ongoing efforts to harden two main tunnel portals, with heavy equipment — including dump trucks, cement mixers, backhoes and cranes — operating across the site.

Concrete was seen being poured atop an extension of the western entrance, while rock and soil were pushed back and leveled above an eastern portal, the report said.

A concrete-reinforced headworks structure has also been added in recent weeks to allow additional layers of rock, soil or concrete for protection.

The group said the fortification work appears aimed at strengthening the tunnel complex against potential airstrikes.