Free-climbing a mountain without ropes or harnesses leaves zero room for error. So when Thomas Perry made a routing mistake on Mount Yonah in Georgia, he quickly became trapped 250 feet in the air with nowhere to go.

Standing on a jagged ledge maybe 20 inches wide, Perry was lucky to get cell reception. Around 7:00 p.m., he dialed 911 to request a rescue from White County Public Safety officials.

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Despite his terrifying predicament,........

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