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Underwater room.png
Where Towards the right in the Hidden Lake
Opened Cave Expedition
March 15, 2010
Closed Still open.
Mini-Games None
ID 815
Tour Description
"BLUB! This place is Underwater... Look at all the colorful fish and plants! And treasure! This place sure is unusual..."
The Underwater is located beside the Hidden Lake. It can only be accessed by following the Giant Squid's shadow in the game Puffle Rescue. After a penguin has followed the shadow, the penguin gets in this room and can then come back whenever they like if they get the Moss Key Pin. Although there are no games to play in this room, the game Puffle Rescue leads to it.


This room was first opened as a members only room during the Cave Expedition. There was a free Coral Reef Background attached to a rock. The background is no longer there and has been replaced by the Moss Key Pin, which is available in exactly the same spot. The room reopened on March 15, 2010 and is only accessible to members. On January 19, 2012 the seahorse and the fish in the room were removed. In 2015, the room was made accessible to former members who collected the Moss Key Pin.



  • This is one of three member-only rooms that are always available.
  • Club Penguin removed the fish, seahorse and the pin (now seen only when you haven't got it yet) to make the game load faster
  • It is one of the most unused rooms next to the Boiler Room. This room is normally empty even on a full server.

Names in other languages[edit]

Language Name
Portuguese Debaixo d'Água
French Sous l'Eau
Spanish Mundo submarino
German Unterwasser
Russian Подводный