There are devices for scooping trash out of rivers, I don't know how well they could be adapted for the ocean. https://news.nationalgeographic.com/2017/02/mr-t

There are devices for scooping trash out of rivers, I don't know how well they could be adapted for the ocean. https://news.nationalgeographic.com/2017/02/mr-trash-wheels-professor-trash-wheels-baltimore-harbor-ocean-trash-pickup/ https://news.nationalgeographic.com/2017/02/mr-trash-wheels-...