A dungeon can be built suddenly without warning at all. It can be in the area, in the area, in the grass, or even in a private home. Although there are places around the world that like sinkhole formation, no one can predict when that will happen. Occasionally, it starts with a leaky leaky pipeline that erodes underground. Every house, building, and road could be entered.
The Qattara depression in Cairo, Egypt will be the world's largest natural sinking hole 50 miles [80 km] long and 120 miles [120 km] wide. Shocking in size, this quick sand hole is dangerous. Recently, there have been proposals to make it a lake by connecting the Mediterranean and Qattara with a tunnel that will fill the hole with water. It is expected to take 160 years to fill the Qattara with water and it will compete with the size of Lake Erie. The Berezniki sink in Soviet Russia started in 1986 and is growing every year. It is now 130 feet [40 m] wide, 80 feet [80 m] long, and 700 feet [200 m] deep. Potash is plentiful in Berezniki and if the sink continues to consume the earth, the potash mine will be destroyed.
In February 2007, Guatemala City witnessed a sudden landslide with about 30 news reports. The pit is a very close circle that killed two people. Damaged sewage system is said to be the cause of the hole. In Venezuela, the pits of Sarisarinama are a beautiful but mysterious natural phenomenon. You will find a number of buses measuring 350 meters wide and more than 350 meters deep. These round dishes have no reason at all. Each hole has a separate ecosystem with species of animals and plants found only in the Sarisarinama mines. Bimmah in Oman has become a tourist attraction.
Mount Gambier in southeastern Australia, between Melbourne and Adelaide, is best known as a city of caves where caves, caverns and streams are located below the globe. Extra rock deposits have been found, the city has natural holes and volcanic craters. The Agrico Gypsum Stack sink was founded in 1994 and measures at least 15 stories in depth. It was built under a pile of 80M gypsum stack that polluted most of Florida's drinking water. This hole is now called the "Journey to the Center from Earth". The hole is now estimated at 2M cubic feet. A type of rock, karst, in South Florida weakens and forms a large sinking hole.
In Texas, the Devil's 400-foot [400 m] Sinkhole was built in the
limestone region. It is 40 feet long by 60 feet wide and is considered sacred
by Native Americans. Stalactites, arrows, and other treasures are collected by
the local people in the pit. In Pennsylvania, a Macungie drilling rig was built
and brought in by nature, with the collapse of the elderly water system. In
Daisetta, Texas, the surrounding area from a 60-foot [20 m] train suddenly
collapsed to form a 300-foot [900 m] high sink. At Bowling Green, Kentucky, a
200-foot-long [200 m] sink was suddenly built.
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