|This article is about the form in Kirby's Epic Yarn. For the transformation in Kirby and the Rainbow Curse, see Kirby Submarine.|
Kirby becomes a pink submarine with his feet doubling as a red periscope and propeller while Prince Fluff becomes a blue submarine, and his feet become an orange periscope and propeller.
While in this form, Kirby and Prince Fluff can swim swiftly underwater by holding button 2. This is the only form where Kirby retains full use of the yarn whip and the ability to throw yarn projectiles. The yarn whip's potential is increased and can now be tossed downwards as well, covering all 8 directions instead of just 5 on land. Kirby's yarn whip will be red instead of pink and the same goes for Fluff as his blue yarn whip will now be orange. Kirby and the Prince carries yarn balls on top of the submarine, just like while on land.