According to Weinthal, “the vast military complex at Parchin, where Iran denied access to International Atomic Energy Agency inspections last month, has more than 100 buildings, many of which lie deep underground. The uranium enrichment complex at Natanz consists of both buried and ground-level buildings.
“A second enrichment facility is buried deep into the side of a mountain at Fordo, near the holy city of Qom. Burrowed under 300 feet of rock, the Fordo facility is located in a hardened tunnel.”
This is where successive bunker-busting attacks will be required, using GBU-28 bunker busters to knock out Iran’s entire nuclear program.
According to the Military Analysis Network, the Guided Bomb Unit-28 (GBU-28) is a 5,000-pound laser-guided conventional munition that uses a 4,400-pound penetrating warhead. The bombs are modified Army artillery tubes, weigh 4,637 pounds, and contain 630 pounds of high explosives. The operator illuminates a target with a laser designator and then the missile is guided to a spot of laser energy reflected from the target.