Live Science
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Cave explorers from Oman have become the first individuals to descend to the bottom of the 367-foot (112 meters) deep “Well of Hell” sinkhole in Yemen, which many local people believe is a genie-infested gateway to the underworld, according to news reports.
The natural sinkhole, officially known as the Well of Barhout, has an eerily circular entrance that spans 98 feet (30 m) in diameter and is located in the middle of the desert in al-Mahra province in eastern Yemen, close to the border with Oman. Amateur cave explorers have entered the sinkhole before, but until now nobody was known to have made it all the way to the bottom.