This reminds me of a story I saw a while back about people apparently becoming obsessed with tunnel-digging for its own sake. I can&#x27;t seem to be able to dig up the story itself, but <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Burro_Schmidt_Tunnel" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Burro_Schmidt_Tunnel</a> was one of the cases mentioned in it.