Engineers have been working to close a cavernous sinkhole that swallowed part of the end zone of a Tennessee university's football stadium.
The 40-foot-wide and 40-foot-deep chasm appeared at the Austin Peay State University in Clarksville on Monday when a construction crew attempted to fill in a much smaller hole that was discovered during renovation on the stadium.
Bill Persinger, a spokesperson for the university, said: "as they began digging, it became bigger and bigger and bigger”. Engineers are now working towards a solution to permanently fix the stadium.
Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved as groundwater circulates through them, according to the US Geological Survey. As the rock dissolves, spaces and caverns develop underground.
In February, a giant mystery sinkhole (some 40ft wide and 20ft deep) swallowed up eight rare cars in a Corvette Museum in Bowling Green, Kentucky.
Sinkholes around the world
Sinkholes around the world
1/9 Dunedin, Florida
The rear portion of a residential home is consumed by a sink-hole November 14, 2013. According to reports, the large sink-hole began to form between two houses the morning of November 14, and grew to size of about 30 feet wide by 30 feet deep
2/9 Clermont, Florida
A building sits partially collapsed over a sink-hole at Summer Bay Resort near Disney World on August 12, 2013. The 40 to 60 foot sink-hole opened up under the resort building reportedly begining late August 11 into early August 12. There were no injuries or deaths reported
Gerardo Mora/Getty Images
3/9 Shenzhen, China
Rescuers prepare to move a dead body found in a sink-hole on a road on May 21, 2013. Five people died when a 33 feet wide sink-hole opened up at the gates of an industrial estate in Shenzhen, the southern Chinese boom town neighbouring Hong Kong
4/9 Chicago, Illinois
Workers prepare to pull a truck from a sink-hole that opened up on a residential street in the South Deering neighborhood on April 18, 2013. The driver of the truck was hospitalized after driving into the 15-feet-deep hole while on his way to work. Two other vehicles were also swallowed by the sink-hole
Scott Olson/Getty Images
5/9 Guangzhou, China
Workers use machinery to fill in a sink-hole that buildings collapsed into near a subway construction site. The hole measured about 1,000 square feet across and was around 30 feet deep, but no one was killed, according to a state media report
6/9 The Dead Sea, Israel
sink-holes created by the drying of the Dead Sea, near Kibbutz Ein Gedi, on November 10, 2011
Menahem Kahana/AFP/Getty Images
7/9 Guatemala City, Guatemala
A man inspects a sink-hole formed in a house on July 19, 2011 in the north of Guatemala City. When neighbors heard the loud boom overnight they thought a cooking gas canister had detonated. Instead they found a deep sink-hole the size of a large pot. The sink-hole was 40 feet deep and 32 inches in diamete
Johan Ordonez/AFP/Getty Images
8/9 Beijing, China
Workers use excavators to fill in a sink-hole which occured overnight on Shiliuzhuang road, in Beijing on April 26, 2011. A section of the road collapsed beneath a truck, slightly injuring the driver and a passenger, who both jumped out of the vehicle before it sank into the hole
9/9 Chevy Chase, Maryland
Utlity workers examine the scene of a car caught in a sink-hole caused by a broken water main, which collapsed part of Friendship Blvd. on December 3, 2010. No one was reported injured in the accident
Logan Mock-Bunting/Getty Images
In March, shocking footage capturing the moment a sinkhole swallowed cars, walls, pavements and part of a street running along a whole block in Baltimore emerged.
Last year, a sinkhole in Florida swallowed a section of a resort villa near Disney World.