Comment by CamperBob2

Famous tunneler: Seymour Cray ( https://shop.minimuseum.com/blogs/specimens/cray-supercomput... )

In his spare time, Cray dug a massive tunnel under his house, complete with a periscope, and joked that elves in the tunnel would help him solve whatever computer problem he was faced with. As Cray himself once said: "I'm up in the Wisconsin woods, and there are elves in the woods. So when they see me leave, they come into my office and solve all the problems I'm having. Then I go back up and work some more."