Crystal Onyx Cave


We are OPEN 10 am (CDT) to 7 pm daily.

About the Owners of CRYSTAL ONYX Cave

Scott Sendtko

Cleon Turner found the cave in 1960, for five years he created trails, stair and bridges.  It opened for tours in 1965 and was owned or operated various people until in 2009 it was sold to Blue Grass Cellular, which has the towers atop of the Knob and the cave was closed.

Scott and Sara Sendtko had toured CRYSTAL ONYX Cave many times and in 2010 they returned for another visit.  They were disappointed to see that it was closed.  Because of the nature of their business, they had been thinking of moving to Kentucky. They had the good fortune to track down the owners and buy the cave.

It took four years to sell their place in Michigan and get established in Cave City.  Then in 2014 they started working on rebuilding the cave.  Over the years Scott has replaced the stairs, bridges and railings, lowered and re-gravelled the trails and installed all new LED lighting. He has also opened up new areas of the cave. It reopened on May 25, 2018 after being closed for nine years.

They have a great love of the cave and Scott feels it is his calling to rehabilitate the cave and share its beauty with his guests. 

Sara Sendtko
Here are statistics on the cave trails and also the outside between entrances and the office. The Great Room trail measures from the upper entry door to the base of the steps in the Great Scott room.

What went into the cave:

Scott lowered the trails so that there is more head clearance whenever possible.  He made concrete steps in some spots to replace steep trails.  54 tons of pea stone was carried into the cave by Scott, two 5 gallon buckets at a time, each weighing 50 lbs. That is 1,080 trips into the cave with gravel.  While in the cave, the buckets were filled with mud, dirt, rock and other debris and hauled back out. Additional tons of rock and dirt were hauled out by wheelbarrow.

Sara mixed 17 cubic yards of concrete weighing 68,850 lbs. Scott carried half of the concrete into the cave two 3 gallon buckets at a time, each weighing 65 lbs. The other half came in by wheelbarrow through the lower tunnel.

He installed 2,000 feet of hand rail, replacing almost all that was in the cave. He also installed an additional 9,000 lbs. of steel I-beams, channel, angle, re-bar, grating etc, to rebuild stairs and bridges.

2,000 feet of electrical conduit and miles of electrical wire were installed. The cave had been electrified with 279 floodlights, 27,900 watts total and 418,500 lumens.  Scott has redone it with 207 LED bulbs using 1900 watts and putting out 155,250 lumens.  The wires are hidden, but the fixtures are visible, consequently, the cave is exceptionally lit when compared to other caves.

To the right is a 360 picture of the Great Room at the bottom of the cave.

Here are some of the Parker and Sendtko work crew having a celebratory dinner at the Watermill in Cave City on April 30, 2018 before the cave was re-opened. Sally, Shirley, David, Sara, Scott, Gwen, Mark and Cheryl.
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