The Iceberg is a hidden room in Club Penguin. It is shown on the map, but is unmarked. Here you can play Aqua Grabber, which was added in February 2008. Penguins like to have parties in this room to see if they can tip the Iceberg, which was started by an old rumor in Club Penguin. On April 5, 2013 background sound effects were added to this room.
The rumour of tipping the iceberg has been created by the club penguin team themselves , you can still see that if you want to send a postcard there is one that say lets tip the iceberg or something like that , with a picture of loads of penguins with jackhammers