The Ocean Cleanup project has analyzed the plastic waste it has fished out of the sea. The results were published in a paper. From the abstract: “The subtropical oceanic gyre in the North Pacific Ocean is currently covered with tens of thousands of tonnes of floating plastic debris, dispersed over millions of square kilometres. A large fraction is composed of fishing nets and ropes while the rest is mostly composed of hard plastic objects and fragments, sometimes carrying evidence on their origin. In 2019, an oceanographic mission conducted in the area, retrieved over 6000 hard plastic debris items > 5 cm. The debris was later sorted, counted, weighed, and analysed for evidence of origin and age. Our results, complemented with numerical model simulations and findings from a previous oceanographic mission, revealed that a majority of the floating material stems from fishing activities. While recent assessments for plastic inputs into the ocean point to coastal developing economies and rivers as major contributors into oceanic plastic pollution, here we show that most floating plastics in the North Pacific subtropical gyre can be traced back to five industrialised fishing nations, highlighting the important role the fishing industry plays in the solution to this global issue.” (Abstract) In a final thesis at the University of Applied Sciences and Arts Northwestern Switzerland FHNW in 2019, a student described and evaluated six projects for the disposal of plastic waste in seas. An overview can be found here. The Ocean Cleanup was also discussed, beside the WasteShark that sticks out as a robot.