or what was that? it just doesn't show how loud or how much energy was released when that thing let go. you could really feel it. it was like the bass at a rock concert. it was just shaking. >> everyone is stunned by the unbelievable surge of power and flames. >> the ball of fire originally started out small. and by the end it was probably the size of a full-size pickup truck. so it was enormous. it was huge. and the vibration of the ground was incredible. you know, when 7,620 volts blows up right behind you, it's tough to be prepared for that. >> the explosion continues for several hundred feet, shooting out sparks and blowing out a transformer. >> watch out, jason! >> another firefighter dives out of the way to avoid being electrocuted. >> watch out, jason! >> went up the street. it kept going up -- there was a transformer up the block, and there was another fire department guy up there. you could see him run and jump over the snow bank to get out of