By using this service and related content, you agree to the use of cookies for analytics, personalised content and ads.
You are using an older browser version. Please use a supported version for the best MSN experience.

6 of the Deepest Holes Humanity Ever Dug

Popular Mechanics Logo By Tim Newcomb of Popular Mechanics | Slide 1 of 7: No one's managed to come out the other side, at least not yet.

No one's managed to come out the other side, at least not yet.
© Staselnik/CC BY-SA 3.0
AdChoices

More from Popular Mechanics

image beaconimage beaconimage beacon