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.

"The discovery emphasizes the dynamic nature of Yellowstone's thermal activity," Yellowstone Volcano Observatory's Mike Poland said.

Christmas came early for geologists at Yellowstone National Park this April when a regularly scheduled survey resulted in finding a new thermal feature at one of the most famous national parks.