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A STUNNED homeowner discovered a creepy secret tunnel built beneath his home after the sidewalk suddenly collapsed.

Gary Machens was trying to repair broken paving outside the Illinois property when one of the slabs fell away to reveal a mysterious cavern.

Gary Machens was left stunned by the discovery beneath his home
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Gary Machens was left stunned by the discovery beneath his homeCredit: Fox 2 News
Gary climbing out of the tunnel - believed to date back to the mid 1800s
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Gary climbing out of the tunnel - believed to date back to the mid 1800sCredit: Fox 2 News

And when he peered into the dark hole he saw a strange stone archway and  brick-lined tunnel he had no idea was there.

After contacting local historians, in the Alton area, he was informed the tunnel was probably built sometime around 1840.

He told  : "[I] had a problem here at the sidewalk and as we were doing some excavating and repacking of the rock here, we discovered this tunnel.

"Whatever they built this for, it took a lot of men and a lot of hours. One guy didn’t do this."

He believes the change in elevation in 1895 when a brick-lined street was built had concealed the original entrance to the tunnel.

Gary now hopes he can open up the tunnel to the public
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Gary now hopes he can open up the tunnel to the publicCredit: Fox 2 News
He was trying to repair broken paving outside his home when one of the slabs fell away
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He was trying to repair broken paving outside his home when one of the slabs fell awayCredit: Fox 2 News
One end of the mystery tunnel is now sealed up with large rocks
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One end of the mystery tunnel is now sealed up with large rocksCredit: Fox 2 News

Gary told how he squeezed into the hole and discovered the tunnel was about 60 feet in length in total.

He added. "There are a few tunnels around the Alton area we found out since we checked with the Landmark Historic Society.

"It’s probably been used as maybe a half dozen things through the years, from an icehouse to a root cellar and maybe a few other options.

"It could have been used for part of the underground railroad. There's no proof of that but there was a major ferry here in the Alton area going back to the Missouri side and it's possible it could have been used for that."

Gary said he would now like to open up the tunnel to the public, but for now he has to finish off the repairs to the sidewalk and seal it up again.

He said he has maps going back to 1863 when there was no sign of a property where his house now stands.

However, when it comes to the tunnel he still "doesn't know" why it's actually there

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