The Sea Bottom Cavern is an area in Jolly Roger's Lagoon in Banjo-Tooie. It hosts Grunty's Submarine Challenge and one of the deepest (only matched by Lord Woo Fak Fak's jiggy). After defeating Grunty's challenge, the area becomes obsolete. If you try to enter it while just being Banjo and Kazooie, Jamjars tells you the pressure down there is too high, forcing you to transform to acsess the mini-game.