Looking for secret tunnel story

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I'm looking for a story I read a while ago. I think it might have actually been posted in another non-4chan forum, but I'm not sure.

What I remember was a guy was talking about a tunnel he had found leading from, I think, his dad's store across the street to some locked building, and it had something like equipment or cars or something in it. His dad(?) told him to keep quiet about it and not to tell anyone, and the poster was worried his dad might be doing something illegal.

I think it turned out his just really like whatever stuff he stored there and used it as a kind of personal museum or place to hang out with his friends.