This article is about something that is no longer active in the Club Penguin universe.
The subject of this article does not have an official name, and as such, it has a conjectural title.
|Where||Underneath Rockhopper Island, also on top of Underwater Room|
|Opened||When Rockhopper first visited|
Rockhopper Cave was a cave in which Rockhopper stored his treasure. The cave was partially connected to a volcanic mountain in Rockhopper Island. This proves that Rockhopper Island was both a tropical and a volcanic island.
- It was only ever been mentioned in Christmas on Rockhopper Island.
- It could be a lava tube in the past, as there are streams of lava inside.