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The Mucky Passage is a sub-area of Spiller's Harbor in Banjo-Kazooie: Grunty's Revenge. It is only accsessible after transforming into Octupus Banjo. It is filled with the same green polluted water as inside the harbor. The pipes holding up the walls appear to be leaking oil. There are several large pipes that can be used as platforms, or as obstacles. At the end of the passage, there is a large raised platform that holds a jiggy above the polution and an exit pipe. After obtaining the jiggy, Mucky Passage becomes an obsolete area.