The left side of the canyon from the resurgence to the dry valley is riddled with passages breaking out into the canyon walls, forming many of the unusable entrances to the cave. Most of these are small passages exposed as the river cut its way down. The exception is the 25 m wide Great Hall that follows the north – south joint pattern breaking into the canyon at the resurgence. Hidden at the end of the Great Hall behind boulders is the hard-to-find Chameleon Passage. This runs along the east–west joint pattern. Some small passages lead from Chameleon to Blank Passage and back to the Big Rapids. Several small passages run from Blank Passage to Boulder Chokes.