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A 33-year-old man remained in critical condition Monday, the day after he was trapped underneath a fallen boulder in Little Cottonwood Canyon.

Unified Police Lt. Brian Lohrke said the 4-by-4-foot boulder toppled onto the man about 3 p.m. Sunday as he and several friends were hiking near Red Pine Lake.

The man's companions tried without success to dislodge the rock, but could not, and called 911 for help.

It took several hours for rescue workers to free the man, finally using inflatable air bags to lift the boulder off his lower body. He was loaded onto a medical helicopter shortly after 7 p.m. Sunday and flown to University Hospital in Salt Lake City.

Lohrke said that the man, whose name was not released, was in pain but conscious when freed. His vital signs were stable as of Monday.

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