This visualization of how deep underground structures go will blow your mind. As you go down as deep as Mammoth Cave, the video pauses and you think it might be over, but oh no. That’s when the scale can no longer show the surface of the earth, and they switch to a graphic on the right for scale to go much, much deeper. The caves, of course, were formed by the earth itself. The manmade structures are astonishing. It’s nice to know that radioactive waste is buried so deep, but the further you go, the more likely they are to be wartime facilities, and even deeper for pure profit. The newer ones were dug by machines, but the older ones were dug by human labor, maybe slave labor or Stalinist prison labor, and who are the people working at the bottom? I looked up a few of the deeper places.
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The Mponeng gold mine in South Africa its so deep that the temperature at the bottom is about 151°F (66 °C), and they send ice down the shaft to cool it to bearable working conditions.
The Kola Superdeep Borehole was drilled over a 19-year period by the Soviets, in Russia near the Norwegian border. It was a scientific project to see how deep a hole could be dug.
-via Laughing Squid
Source: neatorama