This article is about something that was for a period of time or is no longer in Club Penguin.
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The Underground Opening Party, also known as the Cave Opening Party, was a party that occurred in Club Penguin. It began on May 26th and ended on May 29th 2006. The members-only party celebrated the opening of the underground rooms.
- All of the music for this party later was later reused at the Submarine Party 2008.
- This was the second members-only party in Club Penguin, the first being the Pizza Parlor Opening Party.