Submarine Banjo

The Submarine is the native transformation of Jolly Roger's Lagoon. It's controlled in the same fashion as the Talon Torpedo: turn it with the Control Stick and propel it forward with A. You can fire a torpedo at distant foes with Z (press C Up to go into first person view to aim) and press B to unleash a sonic ping attack against closer enemies. The Submarine is the only way to get to the bottom of the Locker's Cavern and play the minigame. It is also, apart from Dragon Kazooie, the only transformation that can fight a boss. It can't warp on to land.

A model of the Submarine transformation appears in Banjo-Kazooie: Nuts & Bolts as an exhibit in Banjoland.