How Get The Underwater Key On Club Penguin

In order to get the Underwater Key to access the Underwater Room on Club Penguin, one of the requirements is that you need to be a member.

Play the Black Puffle level in Puffle Rescue.

On the first level get the Black Puffle. Stay on that slab of rock for a few seconds.

A large squid will appear. Follow it, getting the air bubbles as needed.

It will eventually lead you to a secret entrance. You will then get the key.

Now that you got the key you can now go through the door at the Underwater Lake.

Congratulations! You can now access the members only Underwater Room. (The key should be in the red box as shown in the picture)