Mirny Diamond Mine


Mirny Diamond mine is considered to be the biggest hole in the world; it is located in Mirny, Eastern Siberia, Russia ,it is 1 1/2 km wide, 500 meter deep hole, average winter temperature in mirny is just below -40 Celsius; flights are not allowed  above the hole because due to suction many helicopters fell down into the hole.



El Zacatón Cenote


El Zacatón Cenote is world’s deepest water-filled sinkhole,it is 318 metres deep,it was discovered by the help of robotic vehicle designed for underwater exploration by the National Aeronautic Space Agency



The Great Blue Hole


The great blue hole is a circular shaped hole located 100 kilometers (62 mi) from the Belize City and is 300 metres across and 125 metres deep;it was formed due to rising of oceans ,when limestone caves flooded and caves collapsed.




The Door to hell


This hole named Derweze is located in Turkmenistan, it was discovered in 1971 when drilling was going on by geologists,suddenly ground under the rig collapsed leaving a hole of about 50-100 metres,scientists decided to burn the discharging gas which is still burning since that day.



Sinkhole


In February 2007 a large sinkhole opened in northeast Guatemala city, killing three people. The sinkhole was 100.5 m (330 ft) deep, and apparently was created by fluid from a sewer dissolving the rock underneath. As a result, one thousand people have been evacuated from the area