From Popular Science:
The Pentagon is trying to speed up the deployment of an ultra-large bunker-busting bomb, which would constitute the largest non-nuclear bomb the U.S. has ever used. The Massive Ordnance Penetrator, or MOP, is a 30,000-pound bomb that would dive deeper than any previous bomb, and could be strapped to B-2 or B-52 bombers by July of 2010.
The MOP is 20 feet long and can penetrate bunkers up to 200 feet before exploding. At 15 tons, the MOP is a third heavier than the previous "mother of all bombs", the GBU-43/B Massive Ordnance Air Blast bomb, which was only 10.5 tons. The MOP also packs a whopping 5,300 lbs of explosives, which is 10 times the amount its predecessor bunker-buster, the BLU-109, carried. Basically, it's massive.
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