The Underground Pool was a room in Club Penguin, and is a location in Club Penguin Shutdown. The Agent used to survive there until he broke the windows causing the water to flood in. It was then shown in the Halloween Special where it was the birth place of the Hybrid Sea Monster. Soon, in The Passage, Lil Jeffy and the Purple Mutineer, along with Orange Puffle and Floppy Green Penguin (then Purple), entered it to get past the Tuba Gang Leader to the Night Club.

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