Eight senses are separated from the body, and the ashes themselves have nothing to do with life, just like where your hair falls. What does it have to do with you? As for feng shui, it is even more nonsense.
Sea burial is a way to save land resources without worrying about environmental pollution. It can be used completely.
If you are interested in Buddhism after reading my answer, you can look at the Buddhist materials recommended by me in the introduction.