The Chum Caverns are gorgeous caves. Plankton is able to lure customers in because of how beautiful the caves are. There is a stream, stalagmites, stalactites, and other wonders. Most of the customers are astonished at how cool it was, buying Plankton's 'inedible' food, just to bask in the caves glory. There is a gift shop; it is somewhere down near the tables.
The Chum Caverns are inhabited by strange orange indigenous species known as the Cave Dwellers. Plankton finds them and, after brutally whipping them, makes them his slaves, forcing them to serve customers. Later, at the end of the episode, the caverns get destroyed and the Krusty Krab falls into the cavern. Finally, one of these creatures is seen whipping Plankton at the check-out of the Krusty Krab. Later, Mr. Krabs makes the Cave Dwellers work the register.
Plankton and Karen find them in an attempt to get to the Krusty Krab. They stay because of the beautiful scenery the Chum Caverns has. In order to get to this underground paradise, the customer takes a bucket-shaped elevator. (The elevator is shown below). This is used to get the Krusty Krab out of business by luring Mr. Krabs' customers here for the beautiful scenery, but this backfires later on in the episode.