I did the digging, Nick cleared away the bags and rock, up the slope and stacked the spoil at the top, ready for removal later.
I concentrated the digging effort to the north side of the fissure, where air movement can be detected. Removed a lot of rocks, a mixture of conglomerate and degraded calcite flowstone, some were quite large, and filled bags with sediment. There is still plenty to come out before a clear idea of how this will develop can be made.
How time flies when you are enjoying yourself, all too soon, it was time to depart.