A mysterious hole in a Siberian forest is continuously growing. Locals have been calling it the "Doorway to the Underworld," as monstrous sounds can be heard coming from the massive hole.

The expanding crater, known as the hellmouth, which is located in Northern Yakitia, Siberia has kept the Scientists fascinated. The Doorway to the Underworld is approximately 300ft-deep and half-a-mile-long. This hole known as the Batagaika crater has given researchers with 200,000 years of the planet's climate history.

Alfred Wegener Institute (AWI) published a research about the Doorway. According to him, this Batagaika crater has been increasing at a rate of 33 feet a year over the last decade. In addition, the research also pointed out that in warmer years, the hole has expanded by up to 98 feet a year.

Researchers believe that analyzing the layers of the ground as it becomes exposed, could help forecast the changes that are to come in the future. Scientists have found remains of wood in the Doorway to the Underworld, which suggests there were forest beds and high amounts of pollen, indicative of an open landscape.

They also predict that the growth rate of this mysterious Doorway to the Underworld is most likely to increase at an exponential rate on high temperatures. Moreover, researchers so far believe that climate change is the culprit behind the land failing into an abyss in Siberia.

The closest village to the Doorway to the Underworld is Batagai in the district of Verkhoyansk. Villagers believe it is the portal to the underworld. There are reports that neighboring villages have heard monstrous sounds coming from it. However, scientists debunked this saying those sounds are more likely to be coming from falling soil.

Express reported that Siberia is undergoing permafrost. The soil, rocks, and sediment beneath layers of soil that has been frozen for more than two years are starting to melt. When the permafrost thaws, it causes the land to collapse into rather larger holes like that of the Doorway. These holes most often uncover ancient forest, which acts as carbon heat basins. More greenhouse gasses are released into the atmosphere as more of these ancient forests are exposed.