'Well of Hell': Omani cave team discover what lurks in Yemen’s strange sinkhole
Cavers discover snakes and waterfalls inside Yemen's infamous 'Well of Hell' in world
Danger and demons: Yemen's mysterious 'Well of Hell'
Explorers make a horrifying discovery inside Yemen's 'Well of Hell'
Danger and demons: Yemen's mysterious 'Well of Hell'
The presence of vegetation and wildlife on the inner rim suggests whatever is causing the odours has no effect on either.
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.
Mohamed the prophet had a about the well.
A full report of the team's findings will be made available to the public soon.
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In the 1970s, it was removed from gas and paint in an effort to rein in human exposure across the country.