As admitted by Mitsuhiro Takano (the original script writer for Star Fox 64) in an issue of Iwata Asks regarding Star Fox 64 3D, the development team had initially planned on including more aquatic stages based around the Blue Marine in the original game, but these were removed because they felt they dragged down the pace too much. In the Japanese version of the Aquas stage in Star Fox 64, Falco says:


English SF64's equivalent to this is "This thing will never hold together."

Apparently, this was the result of Takano feeling bad about there only being one underwater stage in all of SF64's single-player mode.