I know a bloke who has made a tunnel into solid rock leading from the back of his house. He did it with a jack hammer, something to pass the time. Actually, he is a gung-ho survivalist, and will use the room as an emergency hide-out of his gear. The only problems with the digging thing, is lack of oxygen, and having the whole thing come down on one. Not sure how to deal with that. Perhaps steel frames and concrete by people who know what they are doing, and an air circulation system? But, there goes secrecy. So, maybe tunnel digging is not such a good idea.

https://www.reddit.com/r/Advice/comments/u3qipy/how_can_i_get_my_boyfriend_to_stop_digging_his/

“How can I get my boyfriend to stop digging his tunnel?

So, I know this is a weird question, but my boyfriend likes to spend a lot of his free time digging a tunnel on some property that he inherited. I haven't seen the full extent of it, but last I saw it was remarkably deep under the surface. He's spent roughly a year on it, and it's evident. The front of the thing is deep, wide, well put together. At the front, which is the only part that I've seen, he's got cement beams, electric lights, even chairs and a small table. I haven't gone into it, but it looked like the quality severely dropped as the tunnel went further, mostly becoming open dirt with some wood beams holding it up.

My biggest concern is his safety, I'm really worried that he's going to dig too deep and it'll collapse on him or something. I've tried voicing this concern to him, but he just laughs it off and assures me that he'll be fine. Aside from safety concerns, there's also the fact that he doesn't really have a social life, because of this thing. I'm pretty much the only person he still talks to outside of his job, and he doesn't go out and do anything anymore. It used to be that he'd occasionally head out and do some digging on the weekends, but now he spends almost all of his free time out there. He still comes home, but he barely spends any time with me, and I know that he isn't doing anything but digging that damn hole in the ground. This can't be good for his mental health, but I don't know how to convince him to stop. He's always really happy when he comes back from digging, which is why I haven't seriously tried to stop him before, but I was talking to a friend about him, and she told me he might be going crazy. Obviously I don't think he's insane, but I hadn't considered the mental health aspect of this, and I just don't know what to do.

TLDR: Boyfriend spends all of his time digging a tunnel, and I'm worried for both his physical and mental health.”

Could be relationship problems, like in the past when men could afford the grog, they spent their time in the pubs. Of course, it must be the men’s fault!