U.S. and Israeli assessments indicate that Tehran stores components of its nuclear program at an underground facility beneath Pickaxe Mountain near Natanz.

From the articleWhat is the ‘Mother of All Bombs’ US may use in Iran?Also in The US is considering using the "mother of all bombs" against Iran - CNN | УНН, US considering using ‘Mother of All Bombs’ against Iran, sources say | CNN Politics, What is the ‘Mother of All Bombs’? Why the US is considering its massive MOAB weapon for potential strikes on Iran