All of them had, at one point or another, fallen into the same trap that Naia had encountered.

The human bones showed no signs of cutting or tool marks, no evidence of deliberate burial treatment.

She had not been placed in the chamber by other people in a formal burial ceremony — or at least there was no evidence of that.

The most plausible interpretation was that she had entered the cave system alive, for reasons that are not recoverable from the evidence, and had at some point fallen into the pit chamber from which there was no exit.

Her bones had then accumulated on the chamber floor, displaced and scattered somewhat by the water that eventually filled the cave system, but remaining largely within the chamber in which she died.