Stepping out of the passage, they found themselves on a narrow stone walkway. Above them stretched a massive natural cave with water dripping steadily from the ceiling, while the strange, multicolored lights reflected off the cave's rock formations, creating an unexpectedly beautiful sight.

The rushing sound of water came from beneath their feet. When Andrew peered down, he spotted a substantial underground river flowing rapidly below them.

Shining his flashlight downward, he saw steam risin