Report by Vince.
I had packed my UV torches (365nm and 395nm) but got distracted along the cross-rift. In hindsight, perhaps I should have packed the compass too. I had gone there to assess the next phase of IRS but started poking at some calcited cobbles comprised of fractured speleothems. I got far enough along the rift to see that it is too narrow to pass higher up, but the interesting thing is that it appears to continue lower down, maybe dropping. There is good air movement and a resounding echo. Frustrating. I’ve got a plan regarding the IRS and will try and sort it out for next week.