Once Clanker is released from the bottom of Clanker's Cavern, Banjo and Kazooie are able to enter and explore the mechanical whale's interior.
There are 5 ways to enter Clanker: through either set of gills, through either golden tooth, and through the blowhole. Once inside, only the gills can be used to leave. Entering through the blowhole drops Banjo and Kazooie directly next to the world's Witch Switch, while a Jiggy appears on Clanker's right tooth and the Pink Jinjo is in the left set of gills. The main chamber (pictured) contains seveal blue hoops, which BK must pass through in quick and correct succession to earn a Jiggy and raise the water level. Using the Flight Pad in the room allows access to the upper chamber where the duo learns the Wonderwing and gets a Jiggy for it. Inside Clanker there are severel jiggies located across the humble mechanical beast.
While there are a few Snippets in Clanker's mouth, the main enemies are the Whiplashes and the spinning blades.