Iran Building Underground Nuclear Facility Impervious to U.S. Weapons

Iran is constructing an underground nuclear facility near Natanz that is likely too deep to be destroyed by U.S. bombs.
Satellite images show four entrances being dug into the mountainside, with estimated depths of 260 to 328 feet.
Completing the facility would complicate Western efforts to stop Iran's potential development of nuclear weapons.
Iran continues advancing its nuclear program and producing uranium at near weapons-grade levels despite warnings from the U.S. and Israel.
Diplomacy is seen as the best path forward, though talks aimed at reviving a nuclear deal with Iran have stalled.