Cade Edmond Siemers, 48, an American citizen who had been living in India, was reported in critical condition at the Burn Center at Eastern Idaho Regional Medical Center in Idaho Falls, a hospital spokesperson told CNN.
Siemers told rangers he walked off a boardwalk without a flashlight late Sunday and tripped into a hot spring, which the National Park Service said caused “severe burns to a significant portion of his body.” Water temperatures at Old Faithful’s vent have been measured at 204 degrees, authorities said, and the geyser’s steam reaches 305 degrees.
Siemers made it back to his nearby hotel room and summoned help around midnight, the park service said, adding: “Rangers detected evidence of alcohol use.”
Siemers was taken by ambulance to West Yellowstone Airport and then via fixed-wing airplane to Idaho Falls. Bad weather prevented the use of a life flight helicopter.
The following morning rangers found the man’s shoe, hat and a beer can near the hot spring, footprints leading to the geyser and blood on the boardwalk.
“The ground in hydrothermal areas is fragile and thin, and there is scalding water just below the surface. Visitors must always remain on boardwalks and exercise extreme caution around thermal features,” the park service said.
Park officials said they were studying whether any damage to the geyser cone merits referral to federal prosecutors.
The injury is the first serious mishap in Yellowstone’s thermal area in two years, when a man sustained severe burns after falling into a hot spring in the Lower Geyser Basin.
A year earlier, a 23-year-old man died after slipping into a hot spring in the Norris Geyser Basin while looking for a place to bathe. The victim’s body completely dissolved in the boiling water, and no trace was found.
Despite posted warnings, two tourists were charged last month with thermal trespassing after they were caught leaving the boardwalk and walking up to Old Faithful for photos. In 2018, a Colorado man was arrested after a viral video showed him appearing to pee into a geyser and stick his face into it.
This article originally appeared on HuffPost.