The Tisza river is one of Europe's most heavily polluted rivers. During the annual floods, thousands of plastic bottles, light bulbs, cans and barrels cross the border from the Ukraine to Hungary. Water authorities do their best to control the plastic flood but during extreme high tides pollution is among the least of their concerns. But in 2013 a non-governmental organization launched a boat race named the "Plastic Cup". The Plastic Pirates had a simple idea: why not build plastic bottle boats from garbage itself, then get onboard and collect as many plastics from the river as possible? Within five years the initiative grew into an international environmental campaign. Our documentary tells the story of the first five years of this inspiring initiative.