Relatively secluded and private, Seymour Cray was also a tunneler... he wouldn't have been making videos about it

The story about him in Time at the time: https://web.archive.org/web/20080521163217/http://www.time.c...

    For Cray, the excavation project is more than a simple diversion. "I work when I'm at home," he recently told a visiting scientist. "I work for three hours, and then I get stumped, and I'm not making progress. So I quit, and I go and work in the tunnel. It takes me an hour or so to dig four inches and put in the 4-by-4s. Now, as you can see, 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."

I wasn't impressed by the 15 metres, but it turns out that is the maximum depth reached, not the length of a tunnel.

Yeah, I though it was 15 meters of length, not that impressive... but it is 15m underground and '... 1,300 square feet of underground space, including tunnels and storage rooms'.

not 15 million tunnels :D

That traditionally would be described as “a maze of twisty little passages, all alike”

Thank you. I definitely read this as million.

If you’re instead interested in a book about a house with 15 million tunnels, read House of Leaves!

I read it as 15 million tunnels too, was very confused. Thank you!

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That is still an impressive water table. I wish ours was that low :-)

oops … sorry … now fixed