Aerial searches continue for a Yellowstone employee who went missing last month while embarking on a solo backpacking trip in bad weather.

Austin King, 22, last called his friends and family from the summit of Eagle Peak in Yellowstone on September 17. In a summit log, the Yellowstone concession worker wrote that he couldn’t feel his fingers and had trouble seeing with his glasses due to the fog.

“I really can’t believe I’m here after what it took to be here. I endured rain, sleet, hail and the most wind I’ve ever felt,” King wrote in a message dated September 17.

Yellowstone’s public affairs office confirmed Friday that Superintendent Cam Sholly requested an “extensive” search because areas of the park previously under snow became visible recently, the Yellowstone public affairs office said. Cowboy State Daily reports.

News week has contacted Yellowstone for comment.

Rescue teams began searching for King on September 22 after he missed his planned boat pickup near the Southeast Arm of Yellowstone Lake in Wyoming.

King was dropped off by boat on September 14 for a planned seven-day trip to the summit of Eagle Peak.

On October 2, Yellowstone changed the search from rescue to recovery. After 11 days of searching, they used more than 100 people, including two helicopters, search dog teams, ground teams and a drone, to search more than 3,225 air and land miles at altitudes ranging from 8 400 feet to 11,350 feet.

“Despite significant search efforts over the past week and a half, we have been unable to locate Austin,” Sholly said in a news release at the time.

“While we will continue to hope for the best, I want to express my deepest condolences to Austin’s family, friends and colleagues. I also want to thank the teams at Yellowstone and Grand Teton National Parks, as well as as well as Park and Teton counties, Wyoming, all of whom worked tirelessly to find Austin in some of the most difficult and isolated terrain in Yellowstone.

King’s family, including his father Brian King-Henke, also conducted their own research. King-Henke is in Wyoming organizing a search.

“Anything is possible. That’s why I’m sitting here. My child is strong,” King-Henke told local news outlet KVTQ on Sunday. “At this point, it’s like we either have to find him or put an end to this.”

“Stay in there. Dad’s coming to get you,” King-Henke texted his son. “The city of Cody itself is coming to my world. I asked for an army and I got an army. And it continues to build.”

King is 6 feet tall and weighs approximately 160 pounds, with brown hair and hazel eyes. King wore glasses, a black sweatshirt and gray pants at the start of his trip.

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