FLAGSTAFF, AZ (3TV/CBS 5) -- Just outside of Flagstaff in the Coconino National Forest sits a cave known as the Lava River Cave. Underground, it's almost a mile of total darkness. About 20,000 people officially visit the caves, with another 10,000 who don't sign in.

[VIDEO: Smokers, vapors, urinators 'Caught Misbehaving' in Lava River Cave]

It's a dangerous climb, with only one way in and one way out. It's cold and slippery, with a constant temperature of around 35 degrees. Despite the lack of light, there is still a level of bad behavior inside the cave. This bad behavior includes tagging, graffiti, trash and people smoking inside the cave, a big no-no.

[RELATED: Injured woman rescued from Lava Caves near Flagstaff]

I visited the caves and climbed inside, where I personally witnessed one person urinating inside the cave while people vaped and smoked. I spoke to volunteer coordinator Paul Dawson, who works for the US Forestry Department Flagstaff Ranger District. He confirmed the amount of bad behavior at this almost secret destination.

Caught Misbehaving with Stanley Roberts exposes individuals who brazenly defy the law or common courtesy, risking social and/or legal consequences. His reports air regularly on CBS 5 News at 10 p.m.

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