A group of veterans, who scour bridges and washes to find and aid fellow veterans who are homeless, discovered what appears to be an encampment holding area for children sold as sex slaves.

Veterans on Patrol stumbled upon the encampment in Tucson, Arizona on Tuesday, but it wasn’t a typical homeless camp.

In the middle of the desert, they found trees with restraints on them at the site, children’s clothing, a baby crib, a stroller, an outdoor bathroom, pornographic material, hair dye and a five feet tall underground cave that had a dresser and crates. The cave was not big enough for an adult, but a child could easily fit inside.

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“The solar lights are what gave it away. If we hadn’t been walking on the right trail we would have never seen it, we would have walked right past it,” one of the veterans, Lewis Arthur, told Arizona local affiliate KOLD. “And we are right there and our city is right there, our children are right there and it’s not my problem if it’s not in my backyard. Now it’s in our backyard.”

After finding the encampment, the a homeless advocacy group notified Veterans For Children Rescue, “a non-profit organization whose mission is to assist law enforcement and Non-Governmental Organizations to eliminate Domestic Minor Sex Trafficking,” according to the organization’s website.

“I didn’t expect to see something this heinous and inhumane this close,” Craig Sawyer, founder of Veterans For Children, said. “I served in the military to keep things like this from happening here, that’s why I risked my security, so nobody here would have to put up with this.”

Sawyer, a Marine sniper and a member of Navy SEAL Team Six, said they did not find anyone at the site, but it appeared like someone had been there about 10 days earlier.

While he has “heard of rooms full of kids in houses and basements and things like that,” while investigating child sex trafficking, Sawyer noted he had never encountered anything “underground like this.”

“An underground cell, that’s pretty creepy,” he said. “In fact there’s another one nearby that they found that they are already digging with fresh tools and fresh dirt.”

Sawyer founded Veterans 4 Child Rescue Foundation in 2017 and has since dedicated his life to raising awareness about child sex slavery, rescuing victims and putting child sex traffickers behind bars. He works with police departments to run covert operations across the country and recruited an elite force with world class skill sets — former FBI, CIA, Delta Force and Seal Team 6 — to extract victims and thin the herd of sex traffickers.

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Weeks after launching his non profit organization, the former Navy Seal warned that two groups have been working to derail his efforts.

“One of them is the Muslim brotherhood. We’ve known they are on the wrong side of history from the beginning – deep ties to terrorism and everything else – pedophilia, there’s no surprise there,” he explained in a video posted on YouTube. “Another one is one of our two major political parties.”