来自MSN8 个月
How deep is Kola Borehole, world’s deepest man-made hole?
The Kola Superdeep Borehole, although only 9 inches in diameter, holds the distinction of being the deepest hole, plunging to ... delving deeper than any other man-made structure.
Business Insider India5 年
These are the deepest and largest man-made holes in the world
America might have landed on the moon, but Russia drilled the deepest man-made hole on Earth. Since the early 1960s, scientists have attempted to drill down to the Earth's mantle. It took 20 years ...
The Sun22 天
Earth’s most terrifying holes from 40,000ft Soviet ‘well to hell’ to Mexico’s ...
It's currently the deepest man-made hole on Earth, reaching a dizzying 40,230 feet below ground. 14 The Kola Superdeep Borehole is locked away beneath a rusty lid Credit: Rakot13/CC BY-SA 3.0 ...
Business Insider8 年
The world's deepest sinkhole was discovered in the South China Sea
Scientists just discovered the deepest sinkhole in the world off the coast of the Paracel Islands, disputed territory in the South China Sea. The Sansha Yongle Blue Hole is almost 1,000 feet deep ...