You’re right, I had to set up a custom movement mode which is basically just flying but only works under water. Lacks much of the good stuff like buoyancy. Yeah for the moment until there comes some reintegration to the old swimming system it’s likely best to run a custom movement. That said I wonder how hard it would be to take the volume information from the post processing volume that’s used (that works with the waves) and toss it into a physics volume? Likely not the easiest modification, but I haven’t looked at the source for the water system myself to verify that.