It would be great, but would require a complete rewrite of the graphics engine. It would add a 3rd dimension to movement, which at the moment is impossible (this is also the reason that jumping is technically impossible to implement, even were it a desirable feature).
There are in fact some 3D models of water creatures (fish, etc.) in the graphics library, as underwater content was at one stage during development considered but later abandoned when the graphics engine was changed to disallow the third dimension for performance reasons (remember, this was 2003/4).
Rewriting it now would likely not be feasible in any commercially viable amount of time.
There are in fact some 3D models of water creatures (fish, etc.) in the graphics library, as underwater content was at one stage during development considered but later abandoned when the graphics engine was changed to disallow the third dimension for performance reasons (remember, this was 2003/4).
Rewriting it now would likely not be feasible in any commercially viable amount of time.