CAVE/KARST FEATURE NUMBER: 5L100
MAXS HOLE (Maxs ‘R’ Hole; perhaps Glenny Heights Cave).
By Peter Horne
Named by divers after a previous landowner, Mr. Max Heininger, Max’s Hole (or Max’s “R” Hole as it was sometimes known by the less-cultured members of the cave diving fraternity!) is a single chamber which is accessed via two roof window entrances which lie underneath a windmill.
Appearing for the first time in CEGSA’s Records as “Unnamed Cave S155” in February 1966, Max’s Hole was described by Trevor Bright as “… two holes each 10 feet across, separated by a rock bridge 3 feet 6 inches wide by 2 feet thick…” and “… surrounded by the remains of a windmill and fence. The holes merge to form a 12 foot diam. shaft with 53 feet free-fall to the floor of the cave”.
The original cased bore was reportedly sunk many years prior to 1966 by Mr. Jack Clarke of Mount Schank, who was an earlier landowner.
The access shaft narrows a little about halfway down, forming something like an hourglass-shaped rim, before opening up into a chamber roughly 12 metres across. Descending cavers land on the top of a steep dirt-pile, which then leads down to two pools of deep water somewhere around the eastern and north-eastern sides.
The date of the earliest underwater exploration in Maxs Hole is not recorded, but it had at least been assessed by 1979 because reference to its small, silty structure was made in Lewis and Stace’s “Cave Diving in Australia” (1980). A further check by Peter Horne in July 1984 found an easily-attained maximum depth of just 15 metres less than 20 metres (guideline distance) from the entrance pools (which immediately led to the same flooded passage/chamber).
The submerged walls and ceiling consisted of very soft, spongy limestone which crumbled constantly under the impact of exhaust bubbles, quickly reducing visibility to less than one metre (and therefore making the dive unsuitable for two or more divers at a time).
The cave does not seem to have much potential for new exploration and has limited recreational cave diving value due to its size and silty conditions.