Need help with vertical NavMesh for swimming AI

I am trying to make an AI travel to random points and specific points within a 3d space. Bascially I have a whale I am trying to get to roam within a water volume and needs to be able to mvoe up and down on the Z axis. Most of the AI pathing I find is related to moving along the ground (XY axis) and i cant find anything that would work for the Z axis as well. How do I create a navmesh that will allow an AI to move to any point within a volume, including the z axis? Is navmesh even what I want to use for this? What is the best way to allow a fish type AI to move in random spaces within a box area and will that also work with things like trying to make them flee or attack while staying within that area? I can figure this out for XY axis but no clue for the Z.

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