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Note that if Render as Geometry is disabled and you render particles below an ocean surface, you might also need to place a geometry that would serve as a bottom for the ocean. This would be needed only when rendering the ocean with a material that uses fog color. Since the particles and the fog of the material are both volumetric effects and are handled differently than meshed geometry, the volume of the ocean liquid must be closed off with another geometry, such as geometry for the bottom. Otherwise the renderer would not be able to determine if the particles are inside of the fog, or entirely behind it and they might render very dark and cause flickering or other undesirable effects in animation. When Render as Geometry is enabled, the renderer would be able to correctly render the particles with respect to the fog even without a closing geometry.