A single ship lost only seven containers, of which six contained plastic pallets. When the storm was over, the water was so polluted that local fishery was threatened. This is an example of how much impact "individual" and "isolated" incidents can have on whole regions and beyond.
Every area of the ocean is polluted, and according to a study made by the Ocean Cleanup Foundation, 99.9% is plastic. Around 10 million tons of plastic and other kind of waste entered the ocean only in 2010.