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Flight. the crews stage of flight that we would have a problem that would be so disastrous, remember, this airplane, according to the initial reports, at least, fell from the sky at 6,000 feet per minute. >> how fast is that? >> that's extremely fast. normal dissent for an aircraft is anywhere from 500 to 700 feet per minute. >> what happens in the cabin to tucker's point? going down 6,000 feet a second is. what's happening in a cabin and what's happened to the passengers at that time? >> depending on what's going on with that aircraft. there is an explosion in this case no one knows what's go...

A hardware start. shot out like bullets, they pierced hard wood. some even melted from the heat. look at the back of it. how fast were these things moving when they went out? >> they can travel a thousand, 2,000 feet a second. >> that's faster than sound. >> that's right. they'll move faster than the speed of sound. these things will get in front of the shockwave and hit you before the pressure wave does. >> you're hit before you even hear it. >> that's right. >> here is what the blast looks like using a high-speed camera. an intense ball of fire less than 20 feet across. but watch the white r...

Up here. >> that shot will travel all the way. >> reporter: down below is the real shock. one bomb turns into thousands of weapons. scattered more than 100 yards. this was part of the pressure cooker. now mangles and razor sharp. no wonder so many people got hurt. instead of nails, we filled the pot with nuts from a hardware store. shot out like bullets, they pierced plywood. some melted from the heat. look at the back of it? how fast were these things moving? >> 1,000, 2,000 feet a second. >> reporter: tha >> reporter: that's faster than sound. >> this will hit you before the shock wave or th...

Moving when they went out of here? >> they can travel 1,000, 2,000 feet a second. they'll actually get in front of the shock wave before the pressure wave does. >> reporter: you're hit before you even hear it. >> that's right. >> reporter: here's what the blast looks like using a high-speed camera. an intense ball of fire, less than 20 feet across. but watch the white rings on the desert floor. that's the shock wave. engineers studying this blast say there's a lesson in here for first responders. let's say i'm a first responder. what do i need to beware of? >> there's a lot of shrapnel around,...

>> the shock wave will travel all the bay. >> down below is the real shock. >> at this point we are looking for fragments. one bomb turned in to thousands of weapons. scattered more than 100 yards. this is part of the pressure cooker now mangled and razor sharp. >> no wonder so many people got hurt. >> instead of nails we filled the pot with nuts from a hardware store. shot out like bullets they pierced plywood. some melted from the heat. >> look at the back of it. >> they can travel, 1,000, 2000 feet a second. >> that's faster than sound. >> they will move faster than the speed of sound. they...