Submitted for your approval, below is a video that is part of an entire series of videos on YouTube depicting a guy working on excavating a tunnel all by himself, using primitive tools.
On the one hand, the idea that someone is constructing a massive tunnel by themselves, using hand tools, working shirtless and barefoot is certainly intriguing.
On the other hand, not only is this completely unsafe and goes against well established standards of practice, but if I understand some of the comments, he is not performing this work at his own property. If true, it is highly illegal, and it exposes the actual property owner to significant liability!
Perhaps there are other hobbies one might want to consider…