Continued the expansion of the passage north-west at the current end of the Cold Gnarly North, beyond the aven. 5no. holes drilled into bedrock, c.550mm x 12mm dia., plus 1no. hole drilled into the large boulder, c.350mm x 12mm dia. Drilled, filled and fired. I could hear fractured rock being re-positioned. Should be plenty to clear for the next couple of digging sessions.