This guide is suitable for current RuneScape and Old School.
Talk to Larry who is near the penguin cage in Ardougne Zoo.
He will tell you of his suspicions regarding the penguins and he will tell you that he wants you to make a hideout, and to meet him north of the entrance to Keldagrim, east of Rellekka. Upon arrival, talk to Larry again and he will sail you to the Iceburg.
Items needed: Oak planks, Hammer, Spade, Steel nails
Talk to Larry again and he will set you a task of building a bird shelter. Use the oak planks on the snow patch to build the shelter, then use the spade on the patch again to camouflage the shelter in snow.
Enter the shelter and a cutscene will follow, showing two penguins greeting each other with three emotes. Take note of this and you will need it later on.
Plank, Silk, Raw cod or Ring of Charos(a)
Larry will then suggest that you make a penguin suit, and will give you a instruction book. To do this, head to a Player Owned House with a level 3+ crafting table and create the suit using the clockwork, silk and plank.
Head back to Larry and show him your completed suit. Upon arrival in the Iceberg, you will discover that the bird shelter has been destroyed. You will now have to test out your suit in Ardougne zoo.Use the 'tuxedo time' right click on Larry to get into the suit. Once you have suited up, enter the penguin cage and talk to the penguin.
Use the greeting emote that you saw in the cutscene earlier on, and if successful, you will receive the mission report and tell you to check in on the Penguin Operatives located in Lumbridge.
Arrive in Lumbridge and head to the sheep pen where the mini-quest Sheep Shearer was done. Find 'The Thing' and talk to it, whilst in your penguin suit. They will not talk to you unless you have the secret phrase however..
Talk to Larry and he will teleport you back to Ardougne Zoo. Enter the penguin cage once more, and talk to the penguin you spoke with earlier. If you have a Ring of Charos equipped, you can use the charm function to get the secret phrase. If not, bribe him with a row cod, for the secret phrase: do not trust the walrus.
Head back to the Lumbridge sheep pen and find the undercover penguins and give them the secret phrase. Tell them that Farmer Fred is harmless and it's the sheep they should be worried about. You will then learn that the penguin outpost is indeed on the Iceberg you built the shelter at previously, and the password is cabbage. You will also receive another mission report.
Feathers, Swamp tar, Mahogany plank, Leather
This section leads up to combat: Icelord, combat level 60.
Report back to Larry and he will take you back to the Iceberg. Tuxedo time with him again to suit up, and head northwest to talk to the KGP agent. Use the emote greeting with him, and the password cabbage. He will not allow you further access however, without ID.
Look around the surrouding area for a penguin called Noodle, and exchange the swamp tar and feathers for his ID and mission report. Return to the KGP agent, and you will be granted access, however you have to take a physical test.
To the left of the agent is the entrance to the agility course. Head down the path and turn west to begin. Complete the course and then exit through the gate. Return to Larry and tell him you have discovered a secret penguin army. You will then learn of a secret room at the Iceberg, and that you should infiltrate it.
Return to the headquarters and head straight down until you come across a KGP agent. Ask him if you can come through and he will tell you that you do not have high enough authority. Head into the east room and talk to Ping or Pong. They will request a cowbell and bongos.
Head to Lumbridge and steal the cow bell from the dairy cow in the farm. Use a mahogany plank with leather to create a set of bongos.
Go back to Larry to be transported to the Iceberg and then tuxedo time to suit up. Return to Ping and Pong and give them the cowbell and bongos. They will create a distraction so you can sneak past the KGP agent.
Enter the room and you will be caught by the penguins. They will take your suit and lock you in a room with Icelords. Kill one to escape then climb through the crack in the room to find yourself back on the Iceberg.
Report your findings back to Larry.
Congratulations! Quest Complete!
Guide Made by: DaDa
Corrections submitted by: Doctor Shemp, DaDa, Runis Altair, Power of Five, Sytze