It is a temporary room for certain parties/events in Club Penguin Rewritten. It may or may not return in the future.
The Mysterious Deep was a party room in Club Penguin Rewritten. It could be accessed by completing the Underwater Maze during the Underwater Expedition. The Deep Sea Diving Suit can also be obtained from this room.
- If you stand next to a set of crystals, they will glow.
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