Hi, we did this particular animation a while back.
Render times between 5-30min per frame on 3-5 980Ti's. Ocean shots rendered in Houdini Octane (2.2) and other 3dsMax Octane (3.0). Waves are made with Houdini Ocean Toolkit and particles are custom setup.
Teaser version of clip https://vimeo.com/202927011