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|When||January 22 – 29, 2010|
|Location||Cave Mine, Hidden Lake, Underwater|
The Cave Expedition was an event in Club Penguin that began on January 22, 2010 and ended on January 29, 2010. It was confirmed on the What's New Blog and issue 223 of the Club Penguin Times. After a rockslide in the Mine in early January, diggers worked to clear away the rubble, only to find unexplored caves. After the expedition, the caves were closed because they were deemed unsafe for how much traffic was going through, although two months later they were reopened permanently.
|Amethyst Pin||Cave Mine||No|
|Coral Reef Background||Underwater||Yes|
Inside the Cave Mine, players could dig in the dirt with a special dance, either by using a using a jackhammer with the Hard Hat, Miners Helmet, or Red Hard Hat, or by using a Snow Shovel. When digging, purple shards could be dug up, and after six were collected, they formed the Amethyst pin. Owning the pin caused the boulder in the room to move, allowing the player to enter the Hidden Lake. In the Hidden Lake, members could buy the Deep Sea Diving Suit to enter the Underwater room.