Comment by Retra

A couple of problems:

1. It's not allowed in most residential areas.

2. If you hit rock, you need new tools. (AKA explosives.)

3. If you hit water, you need new tools. (And it's unsatisfying to have mud wash right into the whole you've been digging.)

4. If you want a roof, you need new tools.

5. If you have to fill your hole back in, it's hard and unrewarding work.

6. You will be pitch black and smell like crap. And your washing machine won't be able to handle it. And you need to bathe vigorously.

7. If you live in a place where you can freely dig, there's probably nobody to show your work off to.