President Trump will have one mission on his mind if he decides to join the war against Iran — destroying Fordow, its most heavily fortified nuclear site.

The Fordow site

MAXAR TECHNOLOGIES/AFP

Buried deep beneath a mountain, only the Americans have the weapon capable of annihilating it.

The 13.6-tonne class GBU-57/B, otherwise known as the Massive Ordnance Penetrator bomb (Mop), has a thick steel outer casing that can penetrate fortifications up to 60m below ground.