Video shows the Northrop B-2 "Spirit" heavy strategic stealth bomber dropping a pair of GBU-57 Massive Ordnance Penetrators (MOP).

The MOP is a precision-guided, 30,000-pound "bunker buster" bomb, significantly more powerful than any bomb of it's kind, that is intended to strike deep into hardened underground enemy WMD storage facilities. As you can see in the slow motion portion of the video, there is a delay between the time the munition impacts the ground and when it explodes, allowing the warhead to get closer to its subterranean target before going off.