I started this as an experiment with the Ocean modifier in Blender.
It took a LOONG while to understand how to punch a hole in it, only to find out - as it awlays happens - that it was super easy:)
I'm also working on a short anim, I just have to smooth out some kinks.
I painted over this a lot, so let's say it's 70% Blender and 30% Krita.