A teenage boy visiting Yellowstone National Park was seriously burned when his foot broke through the ground near a geyser by the infamous Old Faithful, officials said.

The teenager, a 17-year-old boy, was hiking on Monday in the thermal area near the Lone Star Geyser, which is in the same geyser basin as Old Faithful, when his foot broke through the crust, causing “significant thermal burns to his foot and ankle area,” the park service said in a statement.

The incident occurred on Monday morning when the boy was on a hike in the thermal area of the park in the vicinity of the Lone Star Geyser near Old Faithful when his foot broke through the thin crust and he suffered significant thermal burns to his foot and ankle, according to a statement from the National Park Service.