More geological changes are occurring at Yellowstone National Park, as another hole forms in one of the park's basins. The hole is a blue water spring, discovered by geologists in April as they conducted routine maintenance of temperature logging stations at Norris Geyser Basin, according to the U.S. Geological Survey.

Last April, geologists conducting routine maintenance at temperature logging stations in Yellowstone National Park’s Norris Geyser Basin found something unexpected: a previously undocumented thermal pool of blue water.

A hydrothermal explosion has created a 13-foot blue water feature in Yellowstone National Park. The explosion appears to have happened between December 2024 and May 2025. While rare, hydrothermal explosions can result in injuries or death to humans and animals.