That sounds so cool. I like that they are able to do that with you. However, that's the reason I couldn't get one. If you ever get the chance to take pics of their tunnel/cave we would love to see them. Even if you can only get a few feet. You might want to invest in one of those snake cameras that plumbers, etc uses. I think you can get some okay ones for a fair price. Did your friend say if it smelled down there? Curious if they poo and pee down there, or if they keep it clean. Thanks for the update