The historic Fort Steuben Bridge was demolished last Tuesday in a giant explosion.
The 84-year-old bridge connected three communities in West Virginia, but its condition had been rapidly deteriorating. A bridge of this size (1,584 feet) had to be wrapped in 13 pounds of detonating cords and heavy explosives. Detonating cords are thin, plastic tubing filled with explosive Pentaerythritol tetranitrate (PETN). Because PETN explodes very quickly, it's used to link large explosives together in demolishing large, strong structures.