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Re:How can I get my boyfriend to stop digging his tunnel? by Someone on Wednesday April 20, 2022 @11:49AM (#31098693)
It’s rare, but not novel. https://en.wikipedia.org/wiki/Hobby_tunneling lists at least 15 people who had this ‘hobby’.

There’s also https://en.wikipedia.org/wiki/Williamson_Tunnels

Re:How can I get my boyfriend to stop digging his tunnel? by ssteeper on Wednesday April 20, 2022 @03:14PM (#31101589)
> There are dozens of us!
Re:How can I get my boyfriend to stop digging his tunnel? by OJFord on Wednesday April 20, 2022 @02:58PM (#31101382)
Unfortunately it's a term of art in architecture - until I saw that I was quite enjoying 'type: subterranean folly' on your second link!
Re:How can I get my boyfriend to stop digging his tunnel? by YLE118 on Wednesday April 20, 2022 @05:16PM (#31103121)
That first page links to the first person I thought of. https://en.m.wikipedia.org/wiki/William_Lyttle