Explosives deployed from the sky help avalanche rescuers on the ground As search and rescue crews worked on an avalanche recovery mission Sunday in Summit County, experts worked to ensure the safety of rescuers working on the ground in unforgiving backcountry territory. and last updated 2021-02-01 23:55:55-05 SUMMIT COUNTY, Utah â As search and rescue crews worked on an avalanche recovery mission Sunday in Summit County, experts worked to ensure the safety of rescuers working on the ground in unforgiving backcountry territory. Those with the Utah Avalanche Center, Summit County Sheriffâs Office and Park City Mountain Resort Ski Patrol worked with Utah Department of Public Safety to conduct avalanche mitigation in order for rescuers to reach the skier who was buried the day before.