ROUND ROCK, Texas – UPDATE: The cave found underneath a neighborhood in Round Rock is being filled in with concrete, according to Williamson County.

Workers are nearly finished pouring the concrete and the cave opening will be closed.

The job is expected to be completed by Friday and work will begin next week to repair water and gas lines.

WilCo's contractor Chasco Constructors is nearly finished pouring concrete into the cave under Cambria Dr. & Ephraim Rd. The cave opening will be closed with the concrete work anticipated to be completed Fri., Aug. 31. Next week, work will begin to repair the water and gas lines. pic.twitter.com/i2mjADM5lD — Williamson County (@wilcogov) August 29, 2018

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A water leak that caused a cave-in, in a Round Rock Thursday.

The roof of the cave collapsed on the 8400 block of Cambria Road in Williamson County.

"While no one knows why it actually happened. The engineers suspect that freeze/thaw/moisture/drought just flexed everything enough that the roof of the cave collapsed," said Commissioner of Precinct 1 Terry Cook.

Barriers have been put up around the cave-in, and many photos of the cave have now surfaced on social media.

A video posted to Facebook by a woman who lives near the cave-in shows a biologist holding what could be either a stalactite or stalagmite allegedly found in the cave.

The biologist in that video can be heard saying, "Part of the cave was flooded from the broken water line.”

I have been bugging this poor lady about the pictures she took in the cave. They won't allow her to show them to me. Yet. She is showing the stalactite or "mite" she found in the cave. Posted by Michelle Mitchell on Thursday, February 8, 2018

An official with the Brushy Creek Municipal Utility District confirmed that the photo showing a person walking in the cavern was taken in the same cave where the sinkhole is located on Cambria Road.

The interior of the cave as photographed by one of the spelunkers. Posted by Brushy Creek Municipal Utility District on Friday, February 9, 2018

The county and the Texas Commission on Environmental Quality are working to determine the best solution to repair the road after the cave was revealed, according to a Williamson County Facebook post.