Comment by nradov

Cave diving is about the only remaining way for an ordinary middle-class person to do original exploration. There is still a lot of virgin cave in some areas so it's possible to go places where literally no human has ever been before. Sheck Exley, one of the most accomplished cave explorers, was a high school math teacher in Florida. As one other explorer put it, literally more people have been to the Moon than have reached the end of the line in the Wakulla Springs underwater cave system.