Things You'll Need
Instructions
Head to Lumbridge after you receive your first Mission Report from the penguin headquarters.
Speak with Larry, who puts you in the penguin suit. Find the disguised penguins in the sheep pen. The disguised penguins don a sheep's outfit, and there are two penguins per costume; their feet stick out of the bottom, making them easy to spot.
Click "Talk to Sheep," and the penguins will tell you that they are not inclined to engage in meaningful conversation.
Talk to Larry to teleport to Ardougne, and speak with the penguin in the zoo. While talking to him, bribe him with the raw cod. Alternatively, choose the chat option associated with your Ring of Charos (a) to persuade the penguin to reveal the secret code. He will tell you the code phrase: "Don't trust the walrus."
Teleport back to Lumbridge and talk to Larry to change into your penguin suit. Talk to the penguins, who will still be disguised as sheep and will tell you to investigate the nearby farmer.
Talk to Fred the Farmer, who is located in the shack to the northwest of the pen. Head back to talk to the penguins, who will finally reveal the location of the entrance to the secret base, as well as the password you need: "cabbage."