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Authorities set up a wide perimeter. because there is so much land around the building, the plan is to tip the zip over like a tree rather than implode it straight down. that way, fewer explosives are required, according to demolition site manager, eric schuller. >> it was a very solid structure. to install enough explosives to crumble that building upon itself would have been a pretty big feat. to tip it over, it was a lot easier method. the explosive experts removed concrete in between the columns and then installed explosives in those columns. the plan was then to remove that support struct...

>> 5, 4, 3, 2, 1 -- >> whoa. [cheers and applause ] >> the zip dips but it doesn't tip. >> instead of going over like i knew it was supposed to, it fell into this hole. a story and a half was blown out of it and there was really only one metal pipe that broke off. otherwise, the entire structure stood. had the contractor said, what's going on? we said, we don't know. we're not sure why it didn't go down. it may still fall. so we've got to be real careful. >> so why did the building tip but not topple? when the blast knocks out the lower floor, the remaining floors rush down and crush a foundat...

To tip the zip over like a tree rather than implode it straight down. that way, fewer explosives are required, according to demolition site manager, eric schuller. >> it was a very solid structure. to install enough explosives would have been a pretty big feat. to tip it over, it was a lot easier method. the explosive experts removed concrete in between the columns and then installed explosives in those columns. the plan was then to remove that support structure similar to falling a tree, creating a wedge for a tree to fall down to the east. >> on december 6th, 2005, with tens of thousands wat...

>> the zip dips but it doesn't tip. >> instead of going over like i knew it was supposed to, it fell into this hole. a story and a half was blown out of it and there was really only one metal pipe that broke off. otherwise, the entire structure stood. had the contractor said, what's going on? we said, we don't know. we're not sure why it didn't go down. it may still fall. so we've got to be real careful. >> so why did the building tip but not topple? when the blast knocks out the lower floor, the remaining floors rush down and crush a foundation softened by years of standing water. once in the...

>> the zip dips, but it doesn't tip. >> instead of going over, like i knew it was supposed to, it fell in to this hole. a story and a half was blown out of it and really only one metal pipe that broke off. otherwise the entire structure stood. had the contractor -- so we're going what's happening? we don't know why it didn't go down. it may still fall so we have to be careful. >> why did the building tip but not topple? when the blast knocks out the lower floor the remaining floor s rush down and crush a foundation softened by years of standing water. once in the hole, the zip just sticks. >> ...