The Cave Expedition was an event in Club Penguin that began on January 22, 2010 and ended on January 28, 2010. It was confirmed on the What's New Blog and the Club Penguin Times Issue #223. The point of the activity was to explore the caves and the underwater. The free items were a Miners Helmet at the Mine and a hidden pin (The Amethyst Pin) that could be found if you dug all the pieces of it using the Jackhammer 3000 or the shovel. The expedition consisted of three new rooms: the Cave Mine, the Hidden Lake and the Underwater room.