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In a similar vein of cave-related calamities, the Shaft Sinkhole tragedy unfolded on May 28th, 1973, at Mount Gambier. A group of nine expert divers planned a dive at this famed sinkhole, known for its stunning visibility and underwater formations. The divers implemented a careful plan, limiting their depth to 200 feet to remain within a safe range.
As the dive progressed, four divers, unsatisfied with the predetermined limits, decided to descend deeper into the Western section of the cave, aiming for a record of 250 feet. This posed significant risks, as nitrogen narcosis—a condition akin to intoxication—could affect their judgment. Despite noticing the effects of narcosis, the allure of setting a record proved too tempting for these divers.