Collapse at the Crystal Caverns

From publisher blurb: Trapped underground after a cave-in thanks to a violent earthquake, the adventurers must make their way through the mysterious crystal caverns to see daylight again! With the ground shaking and strange crystalline creatures around every corner, can they survive? Collapse at the Crystal Caverns is a Fifth Edition adventure designed for four characters with an average party level (APL) of 7. This adventure is setting agnostic and can easily be inserted into any setting or campaign of your choice, or it can be run independently of a campaign!