Tinkle Inlet Sump
This is a small inlet sump with an unusable airspace. It is 0.7m long but awkward due to mudbanks. One emerges in a low air space canal with a voice connection to base. The passage continues through another duck into a narrow rift, and 60m on there is a junction, with both passages becoming low.
Surveyed to junction at 60m and pushed both passages, estimated 60m.