Personal Experience: This is a pretty cool tunnel, but a short-lived adventure. I am mainly posting this for photographers, filmers and graf heads. It's pretty cool though. There is a lot of confusion that this is the "haunted" tunnel that Youtuber Faze Rug posted about. It is not. That is a completely different tunnel that is in the same region but far more extensive.
We do specialize in tunnel exploration though. Here is a list of some of the tunnels in San Diego that we offer directions to: Specter Tunnel, Alvarado Tunnel, Half Moon Tunnel, Meadowbrook Tunnel and Midland Tunnel. Happy exploring!