The specific character of Hourglass Cave — its length, its depth below the surface, its specific passage character — places it in the category of a substantial cave system that requires genuine exploration to map.

The fact that Hourglass Cave was being actively mapped by cavers in 1988 — that the discovery of the human remains occurred during a systematic survey of passages in the dark zone — indicates that the cave is large enough and complex enough to support that kind of systematic investigation.

Small, simple caves are typically fully explored in a single visit and do not require systematic mapping programs.

The dark zone exploration that produced the 1988 discovery reflects the specific character of serious cave exploration: organized survey of previously unmapped passages, conducted with appropriate equipment and methodology, aimed at building the complete picture of a cave system’s layout.