A new report from the North Carolina Department of Labor revealed that "unidirectional bending fatigue" caused the large crack in a roller coaster at Carowinds amusement park.
Last June, parkgoers noticed a crack in a support column of the Fury 325 roller coaster.
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The ride was then closed for about two months for repairs. According to the North Carolina Department of Labor, the crack had been visible for at least a week before the park was shut down.
The Department of Labor investigation also revealed more cracks on two of the ride's columns, ranging from two to four inches.
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According to Carowinds.com, the Fury 325 is North America's longest steel coaster and is over 1.25 miles long.
The rollercoaster was inspected and cleared last month before the park reopened.