So apparently amateur tunneling can be addictive. Check out tunnel girl Engineer Kala on TikTok if you want to lose your mind on a modern example. William Lyttle is the reining champ; he dug tunnels for fun for 40 years. Destabilized his house, caused sinkholes around town, connected with a rail line.
My fiance and I are doing it ourselves. It's a tiny house and he has a few years of construction experience. We had to learn a lot on the fly, but it hasn't collapsed yet! Seriously though I bet you can do it, especially with a few mates.