About 20 seconds after the first explosion, the entire structure collapsed with all of the debris falling within the Kingdome footprint. The detonation area provided latitude around the entire perimeter for structural debris to fall adjacent to the footprint, but still within the demolition site. Crushed concrete berms were placed across the Kingdome playing field surface to cushion the fall of the roof. Debris on top of these berms in this area was approximately 25 feet high. Debris from the perimeter columns and seating construction fell mostly straight down or inward, averaging piles less than 60 feet high.

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