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It produced the open-face freshwater caverns known as “cenotes” and underground rivers that are in equal parts awe-inspiring and delicate, explained Emiliano Monroy-Ríos, a geologist at Northwestern University studying the region.

The family, like many along the train’s path, was originally opposed of the project because they worried it would destroy the cenotes drawing tourists.

“Our operations have not adversely affected underground caves, cenotes or archaeological sites. In fact, we have mapped, protected and preserved these valuable resources,” the company said in a statement.

Inside the cenote, there is a constant sound of dripping as water percolates through the rock into translucent pools below.

The objects were excavated by archaeologist Edward H. Thompson, who owned the cenote in the early 20th century.