In the most recent excavations in March, 2006, a University of North Carolina at Charlotte student team, supervised by Gibson and Tabor, uncovered an outside corridor leading to what appears to be another cave. The corridor was filled with deposits that date to the Iron Age (within 100 years of the site's original construction) and leads directly into the steep hillside.Read it all for more details.
"Just last summer we found new pools outside up above the cave and a corridor, which our most recent dig shows is leading into what we now think is another chamber," said Tabor. "We're almost afraid to continue because it now looks like this is some huge complex, but now that we are into it, we can't stop."
"We're following the corridor on back and taken it up to a wall of fill – it is leading to something – maybe another cave. The corridor narrows as it approaches the cliff face and up above you can see bedrock, maybe a roof, but in front you can just see fill. It could just be a little enclave, but it just keeps going… it's going somewhere."
(Via the Agade list.)