Photos for Underground Tunnels of Los Angeles
https://www.yelp.com/biz_photos/underground-tunnels-of-los-angeles-los-angeles
Interesting, TY here's another
Police find secret underground lair, shooting range at gang hideout in California
http://newschannelnebraska.com/abc_national/police-find-secret-underground-lair-shooting-range-at-gang-hideout-in-california-abcid36156470/