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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 hole, the zip just sticks. >> ...

Basement under the structure that was actually blasted into quartzite. quartzite is like granite, very solid. it came down and sat in that footprint. >> people were still just kind of dumbfounded by the whole situation. i don't really think they knew what to do or how to react as opposed to just laugh at it. well, we'll see what they do now. can they blow it up again? can they bring any more dynamite? can they bring in more explosives in how long is it going to stay like this? will it be the leaning tower of sioux falls? no one knew. >> things did not go quite according to plan. >> the explosi...

>> 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 hole, the zip just sticks. >> this ...

>> there was a 15-foot deep basement under the structure that was actually blasted into quartzite. quartzite is like granite, very solid. it came down and sat in that footprint. >> people were still just kind of dumbfounded by the whole situation. i don't really think they knew what to do or how to react as opposed to just laugh at it. well, we'll see what they do now. can they blow it up again? can they bring any more dynamite? can they bring in more explosives in how long is it going to stay like this? will it be the leaning tower of sioux falls? no one knew. >> things did not go quite accor...

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 hole, the zip just sticks. >> ...