Iran has been fortifying an underground complex near one of its nuclear facilities, according to analysis of new satellite images. This activity comes amid heightened tensions as talks between Iranian and US officials continue, with US President threatening military action if Iran does not agree to a new nuclear deal. The satellite photos, first analyzed by the Institute for Science and International Security (ISIS), indicate that entrances to tunnels at Mount Kolang Gaz La, also known as Pickaxe Mountain, are being strengthened.

Experts believe this facility might be designed to protect Iran's uranium enrichment activities or key equipment, although its exact function remains uncertain. Iran maintains that its nuclear program is peaceful and does not seek to develop nuclear weapons, despite US claims that Iran was close to achieving nuclear capabilities.

Satellite images from February show signs of fresh construction, including concrete being laid. Analysts have observed heavy machinery at the site, indicating that it may not be operational yet, but that Iran is making efforts to reinforce its defenses against potential airstrikes.

Activities have also been noted at the nearby Natanz nuclear site and Isfahan nuclear complex, including sealing tunnel entrances and backfilling sites to mitigate any risks from air strikes. As international negotiations continue, experts stress the importance of addressing Iran's nuclear ambitions to avert further escalation of tensions.