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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? >> thats extremely fast. normal dissent for an aircraft is anywhere from 500 to 700 feet per minute. >> what happens in the cabin to tuckers point? going down 6,000 feet a second is. whats happening in a cabin and whats happened to the passengers at that time? >> depending ...

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. >> thats faster than sound. >> thats right. theyll move faster than the speed of sound. these things will get in front of the shockwave and hit you before the pressure wave does. >> youre hit before you even hear it. >> thats right. >> here is what the blast looks like usi...

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. >> r...

Moving when they went out of here? >> they can travel 1,000, 2,000 feet a second. theyll actually get in front of the shock wave before the pressure wave does. >> reporter: youre hit before you even hear it. >> thats right. >> reporter: heres 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. thats the shock wave. engineers studying this blast say theres a lesson in here for first responders. lets...

>> 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, 200...

Were going to hear his incredible story. joe is his name, this incredible story ahead. plus, details of the breathtaking on "360." plus new details of breathtaking images. >> all right, anderson, we look forward to seeing you in a few moments from boston. more than a week from the bombings, 50 victims are hospitalized tonight. 13 have had amputations and three lost their lives. the destruction of two crude homemade devices. the pressure cooker detonator explodes with force, propelling thousand...

Real shock. >> at this point were looking for fragments. one bomb -- >> reporter: turned into thousands of weapons, scattered more than 100 yards. this was 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. how fast were these things moving when they went out of there? >> they can travel 1,00...

The real shock. >> at this point were looking for fragments. >> reporter: one bomb turned into thousands of weapons, scattered northern 100 yards. this is part of the pressure cooker. now manning 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 even melted from the heat. look at the back of it. how fast were these things moving when they went out of there? >> they can travel a thousand...