Dream About Secret Passage In Rock Face

I was having lunch outside with some friends, one male and one female. It was our break from work and it was a city park. The park is a pathway that winds through some large natural rock structures. We are talking when all of a sudden the male friend gets out attention and says "hey, look at this". He shows us an space carved out in the rock face, the perfect size for an adult head. Some graffiti headphones are painted on it as well so that the person sitting there with their head inside would look like they are wearing them. I'm just wondering if each of our heads will fit, or if some will be too big when the female friend says "hey, what's back here?" She is standing inside what looks like a doorway carved into the rock and then she disappears around the corner. "C'mon!" She yells. "Does this go anywhere?" I ask, and she says "yeah." We follow her . "Does it stink in there?" I ask. She says that it does. I imagine possibly like sulfur, gasses from inside the rock, or from the piss of homeless people. I guess I'll find out. We follow her. Around the corner inside the rock face, about waist high, a ramp ascends up to another turn. It is too high to step up given my weight I cannot just pull myself up like my friends but there is a railing and if I grab it I can shimmy onto the ledge on my stomach. The passage is narrow and the walls are covered with graffiti. "Probably a gang hangout" I think to myself. My friends have disappeared around the corner and I am eager to catch up with them. I am also con wines about getting stuck in the narrow hall. I wonder if it broadens around the corner or ends in some narrow little space that will be uncomfortable to sit in. Next, my friends come back with a sense of urgency, "C'mon let's go" they say, rushing back down the passage. They must not like what they found back there. I quickly follow them, imagining all the things it could have been: a den with drug paraphernalia, a homeless encampment, a place where some serial killer was hiding his bodies. I won't see for myself, but I can ask later. We make out way back outside to the path in the park. It's time to get back to work anyway and the park is beginning to fill up with rabble - all our colleagues have come now, to have their loud obnoxious and boring conversations about their mundane lives. I am glad we got here before they all did - when everything seemed untouched.