Revealing mistake: When the blue record gets messed with, they decide to blow the 2nd set of explosives anyways because of impatience. It's obviously heard and the FBI guy wants to check it out. The first explosion made a dusty mess which took a while to clear. How did they clean up the 2nd explosion, and have time to put boxes in front of it before Ben and the FBI guy got down there? There was very little time in between the explosion and them getting to the basement.