The GBU-57 A/B, weighing roughly 30,000 pounds, is a precision-guided bomb capable of penetrating about 200 feet below the surface before exploding.

Maxar Technologies released satellite imagery on Sunday showing activity at Iran's Fordo nuclear facility prior to U.S. air strikes.

Iran’s most heavily fortified nuclear site is at Fordo, a hilly area south of Tehran and about 15 miles away from Qum, a city where more than a million people live.