The Hidden Lake was a subterranean lake in Club Penguin. It opened out to the sea, and a variety of sunken treasure drifted here from underwater. Waterfalls flowed here into the sea from underground reservoirs. The Hidden Lake was first discovered during the Cave Expedition. An underwater door here led to the seafloor, but the door could only be opened with the key. After the Island Adventure Party 2010, a ladder could be climbed here in order to access the Forest.
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