Located 400 feet beneath the surface, this spot is not for the faint of heart. Be prepared to face your deepest fears and darkest doubts, as the crushing pressure and eerie silence will test your resolve.
But don't worry, the views are worth it. On a clear day, you can see the faint outline of the surface, a distant reminder of the world above, where the sun still shines and the air is breathable.
Recommended for: thrill-seekers, masochists, and those seeking a spiritual experience.
Don't forget to pack your oxygen tanks and your sense of humor.