about 15 years ago I went through the birthday tunnel at berringa, it went down 3 levels before a cave in and was not game to continue any further. I went back their about 12 months ago and found it had been closed off and heard it had been filled in with about 5 meters of concrete. I went back their gold detecting last week and foud th someone has dug down to the concrete at the adits entrance. I am curious as to if anyone knows if the air in te mine would be stale or no anymore about why it was capped off. cheers tim (pnp281)