Underground

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The Underground is a somewhat secret area that was released at the member party in May of 2006. Afterwards, it was open to all penguins. The rooms in the Underground are:

• The Boiler Room - A room where you can read old editions of The Club Penguin Times. This can be accessed easily from the speaker in the Night Club.
• The Cave - A Pool in a cave. This can be accessed easily from the manhole in the Plaza.
• The Mine - A room where you can play Cart Surfer. This can be accessed easily from the Mine Shack,
• The Mine Shack - The only aboveground area.
• The Cave Mine - A hidden Cave that was discovered during the Cave Expedition and later reopened to everyone on March 15, 2010.
• The Hidden Lake - A hidden Cave that was discovered during the Cave Expedition and later reopened to everyone on March 15, 2010.
• The Underwater - A deep sea area that was discovered during the Cave Expedition and later reopened to members who have the Moss Key Pin on March 15, 2010.

The Underground could also reference:

• The Underground from the Norman Swarm Has Been Transformed play.
• The Underground Stamp that you may get on Club Penguin.