Austin King, 22, has been missing since he failed to return from a week-long solo excursion to summit Eagle Peak, the highest point in Yellowstone.

Austin King a concession worker at Yellowstone has been missing since Sept. 17 when he told his family and friends poor weather conditions were moving in as he called them from the Eagle Peak.

The search continues for a 22-year-old man in Yellowstone National Park who hasn’t been seen since last Tuesday. A news release from park officials Tuesday afternoon says air and ground crews are searching for Austin King near Eagle Peak in the park’s remote southeast corner.