In 1971 geologists discovered a large underground cave filled with natural gas while drilling in the Turkmenistan village of Derweze.

1971年，地质学家在土库曼斯坦达尔·瓦扎村庄进行钻井工作时，发现了一个巨大的充满天然气的地下坑洞。

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The find was made 1.5 miles (2.5 kilometers) underground during exploratory drilling for geothermal energy.

这次发现是在一次地热能钻探时，钻到地底1.5英里(2.5千米)的一次偶然事件。

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Open-pit mining follows the same sequence of oprations as underground mining: drilling, blasting, and loading and removing waste and ore.

露天采矿遵循与地下采矿相同的作业顺序：钻孔、爆破、装载并运走废料和矿石。

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Some of them say the water was spoiled by drilling deep underground for natural gas.

NPR: Cause Of Off-Color, Fetid Water Eludes Pa. Town

But the potential won't be realised until drilling for the underground gas is allowed.

BBC: Budget: What's in it for the East Midlands?

Scientists have linked the underground injection of oil-drilling wastewater to a magnitude-5.7 earthquake in 2011 that struck the US state of Oklahoma.

BBC: Oklahoma earthquake linked to oil extraction wastewater