Officials are still determining what caused a massive sinkhole that was discovered Wednesday morning at the Louisville Zoo.

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Giant sinkhole the size of a football field closes zoo in Louisville and Mega Cavern. via WLKY TV

The zoo closed after the sinkhole was discovered around 8:30 a.m. near the park’s southwest corner, far from any animal exhibits. No animals or people were injured.

Officials estimated the sinkhole is about 50 yards wide and 85 yards long and possibly 50 feet deep – almost the size of a football field! But it’s “potentially larger or deeper” in some areas.

Officials had already closed the nearby Louisville Mega Cavern due to a 3.4 magnitude earthquake reported Tuesday about 33 miles northeast of Knoxville, Tennessee. It’s the cavern’s standard procedure to close if seismic activity is detected, said Charles Park, the cavern’s executive vice president.

Cause of ground collapse remains unknown

An engineer who inspected the area does not believe the sinkhole was caused by the earthquake because of the timing, Louisville Metro Emergency Services Director Jody Meiman said. The earthquake was reported around 4 p.m. Tuesday and officials believe the sinkhole formed between late Tuesday and early Wednesday morning.

Meiman said the sinkhole could have been caused by rain runoff or “natural occurrences” underground, but officials were still working to determine what happened. 

Late Wednesday, engineers were evaluating whether the sinkhole could continue to grow. Geotechnical and mining engineers were on site, as well as officials from Louisville Water, Metropolitan Sewer District, Louisville Fire and Louisville Gas & Electric. 

Sinkhole location and safety

Meiman said that the sinkhole is near the edge of the cavern and that some debris fell into an unoccupied section of the cavern. Crews will continue inspecting that part, which is under the zoo, through the night.

But the nearby commercial and residential areas have been deemed safe, Meiman said. Crews monitoring utility lines had not noticed “any adverse effects” or danger to neighbors in the area, who had been notified of the sinkhole.

The zoo and the Louisville Mega Cavern will remained closed until further inspection deems them safe. 

Right now, our priority is safety,” Louisville Zoo Director John Walczak said. “So we’re going to let all the engineers do their work, and we’ll make that determination (to open) when they say it’s safe.

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[USA Today]

Home Forums Louisville zoo closes after SINKHOLE the size of a FOOTBALL FIELD forms just after M3.4 earthquake in Tennessee

This topic contains 3 replies, has 2 voices, and was last updated by  Space Traveler in Alabama 1 week, 5 days ago.

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  • #168309 Reply

    Strange Sounds

    This reminds me of another giant growing sinkhole that opened up in a golf course in Branson, Missouri in May 2015. It was only 85 feet large. Now it has grown to a montrous 200 feet wide and 100 deep crater and some caverns were discovered in it!

    As if our Earth looks sometimes like Swiss cheese underground 🙂

    Monster sinkhole at the “Top of the Rock” golf course in Branson, Missouri has grown up

  • #168311 Reply


    In this article they report a sound in an unoccupied portion of the Mega Cavern located under the Louisville Zoo. Were they building something down there?

  • #168355 Reply

    Space Traveler in Alabama


    The cavern was mined from the early 1930’s to the early 1970’s.
    The mine goes under all 10 lanes of the Watterson Expressway (I-264).
    The portion of the mine under I-264 was quarried before the highway was built in the early 1930’s.

    Mega Cavern is classified by the Metro Louisville Government and the State of Kentucky as a building. As a matter of fact, it is the largest building in the State of Kentucky and has been given its own building code.

    The ground above and the underground below have separate zoning classifications. It is the only dual zoning area in Kentucky.
    The underground is privately owned.

    The underground has radiant heat from rock, heavy insulation, motion detector lights, and recycles the heat from the lights and machines, as well as human bodies in the cavern.

    Approximately 70% of the Louisville Zoo is located above the cavern.
    The limestone in this area is part of the Cincinnati Arch.

    I tell you this cavern is a part of the Reptilian Secret Underground System in the US. Why it collapsed? Of course, Galactic Federation of Light cleaned up their secret underground bases caused this sinkhole and quakes.This cavern has some space where children can play. I bet many children have been abducted and eaten by Reptilians.

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