Utah - It was like a scene out of a horror movie: two hikers, alone in the frigid wilderness with no cell reception, suddenly stumbled into a pool of quicksand.
On Saturday, Ryan Osmun, 34, and Jessika McNeill from Arizona were about three hours into the Subway trail route in Utah's Zion National Park when their scenic walk took a turn. McNeill tripped, landing in quicksand. When Osmun attempted to rescue her, he too became trapped and buried up to his knee.
"There was no chance of moving it at all," Osmun told CBS News. "The sand had surrounded the whole leg, and I couldn't move it."
Quicksand forms when water or air becomes trapped in sand. If exposed to a sudden shock or stress, like the weight of a hiker, it can become unstable. If something - like a limb - is submerged, it is incredibly hard to escape.
"Quicksand is not normally a problem at Zion, but it does happen if conditions are right," said Alyssa Baltrus, a spokeswoman for the park. "We have been unusually wet here this winter. The weather was most likely a contributing factor."