According to the Pentagons' director of operational testing, Michael Gilmore, tests conducted on the Massive Ordnance Penetrator GBU-57, a 20-foot long, 30,000 pound GPS-guided bomb , have demonstrated that the bomb is able to destroy deeply buried, reinforced targets. The Massive Ordnance Penetrator is six times bigger than the 5,000 pound bunker- buster that the U.S. Air Force and the Israeli Air Force currently have in their war chests.
From the Business Insider:
The MOP is the bomb experts believe Israel needs if it wants to de-rail Iran's nuclear program for any length of time. While our Mid-East ally has a fresh supply of GBU-28 bunker busters, they are one-sixth the size and far less capable.
The MOP might actually be the only conventional bomb to best Iran's concrete technology, which is perhaps the most advanced in the world. The country lies on a very active seismic fault, making earthquakes a part of Iranian life. In response, Tehran's concrete industry has developed Ultra-High Performance Concrete (UHPC) doped with quartz and poured under the country's own high-demand blend of international codes.The B-2 stealth bomber is the only aircraft capable of carrying this massive weapon, which carries over 5,300 pounds of explosives
Mahmoud- who says size doesn't matter?