On this day in Club Penguin History there were updates in the year 2010. They all have to do with the Mine. Up until the 22nd of January in 2010, the Mine Cave, Hidden Lake, and Underwater rooms did not exist. They were all released! Previously (a short while before these rooms were released) a hole in the wall in the Mine appeared. After it being deemed safe, it was widened so penguins could fit through. From there it was realised there was the three new rooms! Puffle Rescue was released later, in March.
When these three new rooms were first released, you had to go to the Mine Cave, wear a Hard Hat, and drill. Eventually you would find four pieces for the Amethyst Pin, which let you access the Hidden Lake. (a big boulder blocked the entrance and getting the pin caused it to roll away) From there you could access the Hidden Lake room. You then had to purchase a Divers Suit (members only) to go Underwater and retrieve the Coral Reef Background. There was also a new login screen released to advertise this.
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