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.

On Monday morning, a 17-year-old male suffered what Yellowstone National Park officials say are “significant thermal burns” to his foot and ankle area in the vicinity of Lone Star Geyser near Old Faithful.