3 of us did the Greater Nenthead Traverse yesterday, a trip we enjoyed immensely! However, there's a shale collapse in CC Low Level about half way between the top of the incline, and the toilet block junction which we initially thought had blocked the passage. I had to brush aside some loose shale to get through, so I suspect it's changed recently. It's just possible to slide through without touching the ceiling, but it's clearly going to come down some time soon causing a total blockage. The hanging ceiling slab is very large, and you definitely don't want to be underneath it when this happens. Extreme caution advised!