GOBLIN VALLEY, Utah (CNN/KSTU/KUTV) - If you spend much time outside in parks -- you've probably heard the phrase: "Leave no trace."
But a group of men are facing possible legal action for the change they made at a Utah state park.
At the center of the investigation: a 200-million-year-old boulder and a video recording.
It starts like an ordinary tourist video: three Boy Scout leaders posing alongside a 200-million-year-old rock in Goblin Valley, Utah.
One of them starts to wiggle it, and then it topples to the ground. You can hear the men laughing in the background, one jumping up and down on a nearby boulder.
But it's no laughing matter. These men could face felony charges for toppling the ancient rock.
The sandstone boulders date back to the Jurassic period, and it's against the law to deface them. A park official calls the video disturbing, sad and hard to watch.
"Obviously, we're very concerned and upset that somebody would come and destroy this natural wonder that took millions of years to be formed,” said Jeff Rasmussen, deputy director with Utah State Parks & Recreation.
"Muscles over here pushed it off,” said Dave Hall, the man who shot the video.
But, despite the high-fives seen in the video, the accused vandals say they thought toppling the formation was a good thing.
"Some little kid was about ready to walk down here and die, and Glenn saved his life by getting the boulder out of the way. So ...," said Hall, one of the accused vandals.
Hall told CNN affiliate KUTV that the Goblin rock was already unstable and that he was afraid it would fall and harm someone.
"That thing wobbled. I looked at that main path, that main walkway, and thought 'One gust of wind and a family is dead,'" said Hall. "I don't regret it one bit."
"Would you do it again?" asked a reporter.
"Absolutely. Absolutely," said Hall.
The park's deputy director says in his 22 years, no one has been hit by a falling Goblin.
It's not yet clear what charges the men could face, as authorities are still investigating. Meanwhile, authorities say the accused vandals probably never would have gotten caught if they hadn't posted the video on Facebook.
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