What a Hell hole!Archived 2013-03-01 at the वेबैक मशीन, Rob Preece, 12 सितंबर 2012, Mail Online (UK), ... Soviet geologists were drilling at the site in 1971 and tapped into a cavern filled with natural gas. But the ground beneath the drilling rig collapsed, leaving a hole with a diameter of 70 metres ...
What a Hell hole!Archived 2013-03-01 at the वेबैक मशीन, Rob Preece, 12 सितंबर 2012, Mail Online (UK), ... Soviet geologists were drilling at the site in 1971 and tapped into a cavern filled with natural gas. But the ground beneath the drilling rig collapsed, leaving a hole with a diameter of 70 metres ...