What happened at the end: when did the last child come to rest in the underground space?

The radiocarbon data provides a window for the use of the feature, but the specific final interment — the last time the space was opened and the last small body placed within it — is not recoverable as a distinct event from the dating evidence.

At some point, the practice stopped.

The space was sealed, or simply no longer used.

The centuries accumulated over the bones in the limestone darkness.

And then, in modern times, archaeologists opened the space and found what had been left there.