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 ...

It is found within the crescent-shaped Mariana Trench, the deepest trench on Earth. The Challenger Deep plunges to an estimated 10,935 metres (roughly 6.8 miles) below sea level - more than 1.2 ...

Following is a transcript of the video. Narrator: The Mariana Trench is the deepest point on Earth. So deep that if you dropped Mount Everest inside, its peak would still be more than a kilometer ...