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Seymour Cray used to dig tunnels.

NOTE: This is probably a very dangerous activity.

This is a thing. Some people just like to dig.

Heck yeah it's dangerous! Ever read about the bitcoin millionaire who hired someone to dig a tunnel system under his house and the worker ended up dying on the job? Crazy story: https://www.cbsnews.com/news/md-millionaire-charged-in-death...

To be fair, digging tunnels is not quite as dangerous when your boss isn't a complete nutcase. This was an exceptional case.