Octopus

The Octopus is a quest item used in the quest Hunt for Red Raktuber. It is used to turn the wheel in the engine box. Wearing the Octopus may also be a requirement to use the conch shell to signal the penguin submarine to surface.

The Octopus can be worn on the head after completing the quest. It is only used for appearance and as a sign that the player has completed the quest as it has no bonuses. It is acquired at the same time as the three other headgears (Puffer, Ray and Monkfish) from the quest.

The fish hats are the only items that can be worn as a penguin as a forum avatar in the RuneScape Forums.

Trivia
The Octopus head can be a crude costume for Davy Jones from Pirates of the Caribbean.