Shrouded in mystery and tales of demons, Barkhut's well in eastern Yemen, known as the "well of hell," is an obscure natural wonder.
Closer to the border with Oman than the capital Sana'a, 1,300 kilometers away, the giant hole in the desert of Al Mahra province is 30 meters wide and 100 to 250 meters deep.
Local folklore says that it was created as a prison for demons - this reputation is reinforced by bad smells rising from its depths.
Yemeni officials say they don't know what's underground.
"It is very deep - we never reached the bottom of this well because there is little oxygen and no ventilation," said Salah Babhair, general director of the Mahra Geological Exploration and Mineral Resources Office.
"We visited the area and entered the well, going down to a depth of more than 50-60 meters. We noticed strange things inside. We also smelled a strange smell … This is a mysterious situation."
Sunlight does not penetrate far into the structure, and little can be seen from its edge, except for birds that fly in and out of its depths.
Videographers who are trying to view the inside of the well in close-up say that it is almost impossible to remove it - according to local superstitions, objects near the hole can be sucked into it.
Babkhair said that the well is "millions and millions" of years old.
"Such places require additional research and study," he said.
Over the centuries, stories have circulated that evil, supernatural beings known as jinn live in the well.
Many locals are still afraid to visit the area where this huge hole is located or even talk about it, fearing that from the abyss, which, according to legend, threatens life on Earth, misfortune may come.
Yemenis are already unlucky.
Since 2014, there has been a civil war between the government and the rebels in the country. The United Nations claims that Yemen is facing the world's worst humanitarian crisis, with tens of thousands killed, millions displaced and two-thirds of the country's 30 million people dependent on some form of aid.