The Pickaxe Mountain facility remained untouched during operations Rising Lion and Roaring Lion and Trump is now threatening 'a nice, big, fat shot'; but the at least 80-meter-deep facility may be immune to even the most powerful bunker-busting bombs

Satellite imagery has detected recent construction at the underground facility.

Buried under 600m of granite, the site is assessed as beyond the reach of even the US' most powerful bunker-buster bombs.