That’s what I was thinking. If it were a couple of kids ages 12-17, sounds pretty normal. Older than that.....?
The article doesn’t list ages but it says something about “think about a kid wanting to build a tunnel and add 15 years to that...” which would put the adult males around 25ish? I don’t know if this is a “guy” thing but IMHO.. any adult male who goes to this length for a place to “hang out” is up to no good. Reminds me of a Criminal Minds episode where the serial killer has a tunnel to keep his victims. It is just creepy.