When The Water Came In

The flooding of the Yucatán cave system — the process that turned Hoyo Negro from a dry pit into the underwater chamber where Naia’s bones were eventually found — was not a single event.

It was a gradual process that played out over thousands of years as the Ice Age ended and sea levels rose.

The specific timing of the flooding of different parts of the cave system depended on local geology, on the specific passages that connected the cave to the ocean, and on the rate of sea level rise during different phases of the glacial retreat.

Different chambers may have flooded at different times.