Masson Cavern Roof Cracks

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IIRC that was a packwall on a steeply descending section that we rebuilt and mortared to make sure it stayed in place, rather than specifically a roof support. That aside, I agree it's definitely worth seeing what we can do in terms of packwall or cog to make sure this entrance to Masson stays open. Suggest you keep the stainless rebar for when we really need it though Phil, regular rebar supports should outlast us given how well the sites you mention have lasted on old drills!

Yes - I was there when Ric built that packwall (March 2011), but the roof support to which I'm referring was done a lot earlier (April2009 - I was there on that occasion too). It's on the right hand side of the main passage well before you get to the packwall you mention, and it's a great piece of work. Something similar might be a good solution at Masson.