Sea Bottom Cavern

The Sea Bottom Cavern is an area within Jolly Roger's Lagoon in Banjo-Tooie. It is only accessible while transformed into Submarine Banjo, as Jamjars blocks Banjo and Kazooie if they try to enter while in their regular forms due to the water pressure inside being too high.

The cave hosts Grunty's Submarine Challenge, where Submarine Banjo needs to shoot Shrapnels to score points and obtain a Jiggy.