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.

A brand-new discovery in a popular national park has “explosive” beginnings.

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.