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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.
Don't worry, they definitely won't go that route of helping everyone a lot when they could help their people just a little.