Went to the Tuck Shop, 6no. holes, spread along the east-side of the fissure going south. The aim is to widen the narrow gap and make the link to the aural connection with the passage left of the T-Junction. There is also the possibility there might be another lead to follow.
The first use of the new drill, batteries didn't have much charge, good job I had brought some spares.
It sounded much louder from Stal Bend.