The site, located near the Natanz nuclear facility, has drawn renewed attention after satellite images revealed a fortified tunnel system and expanded security perimeter.
source https://www.ndtv.com/world-news/pickaxe-mountain-site-near-natanz-facility-may-be-hiding-irans-uranium-8766815#publisher=newsstand
source https://www.ndtv.com/world-news/pickaxe-mountain-site-near-natanz-facility-may-be-hiding-irans-uranium-8766815#publisher=newsstand