When survivalist bug out to help them prepare for when a disruptive event occurs, we can see some pretty unusual things. Some of the things we see are structures that have been through for thousands of years. Some of them give us clues as to how people survived in the best. No matter what you've seen before, these extremely strange holes in this video from Danger Dolan will blow your mind!

Conclusion: It is just truly incredible where these holes are found and how huge they are! Some of the sinkholes are underwater. One of the holes is unique diamond mine in Russia. Some sink holes are in caves and have had to be protected because of people want to hunt for treasure or diamonds.

Even for a survivalist digging holes, this deep hole would be pretty difficult to do. You definitely wouldn't want to find yourself stuck in one when SHTF!