Or anyone but it didn’t. The tunnel is about ten feet long so it’s very tiny but the dirt above is probably very heavy. This material isn’t just rocks, it seems to be more like very old dried-up mud that is rock hard. The information board is a bit hard to read in the photo, sorry. I will go back to this place again to see what else I can find, perhaps some cool rocks which I did bring back with me yesterday. Learn about this place.