The Underground Pool (or more formally known as the Cave) is an underground room that houses a swimming pool, windows, some swimming boards, and a Lifeguard chair.
|Polar Paw Print Pin|
|Checkered Flag Pin|
- The Go Swimming Stamp can be earned by going into the Pool and wearing the Rubber Duck. This is one of the two places in Club Penguin Rewritten that allows this, along with the Cove.
- During the Medieval Party 2017, this was one of the most significant rooms, as the Ye Knight's Quests were accessed from here.
|Ye Knight's Quest 1 (Medieval Party 2017)||Ye Knight's Quest 2 (Medieval Party 2017)||Ye Knight's Quest 3 (Medieval Party 2017)|
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