The GBU-57A-B Massive Ordnance Penetrator (MOP) is 5,300 pounds of high explosive wrapped in 30,000 pounds of steel, and designed to obliterate fortified positions and underground bunkers from the inside. Developed by the US Air Force with help from the Defense Threat Reduction Agency (DTRA) and built by Boeing, the…

The 30,000-pound GBU-57A/B Massive Ordnance Penetrator is not hard enough to take on Iran's current nuclear facilities, said Pentagon sources to the Wall Street Journal.

Smile, you GBU-57A/B Massive Ordnance Penetrator you! Or like I like to call you: Mr. Holmes, the 30,000-pound (13.6 metric tons) precision-guided bunker buster. That's 25,000 pounds heavier than the largest bunker-buster available.