Comment by gadilif

The specific composition of this specific mountain range in Fordow made it almost ideal for this purpose. It's not only the depth, but also the rock type, the fact that the rock layers were compressed, and overall accessibility - all of these limit the selection space for 'deep holes in the ground for building a nuclear facility'. Also, you need to take into account an important fact: It is in Iran... There may be other, better locations on Earth, but having sovereignty on the land is key:)