Seagrass does not only stores our planet’s largest reserves of sugar – it protects beaches worldwide from erosion cleans water like an sewage treatment plant. No other living creature on earth reaches a lifespan of almost 80,000 years. It is a nursery and habitat for countless species and purifies the sea water like a gigantic sewage treatment plant. With these superpowers, seaweed can slowa global warming. The film accompanies the leading seagrass researchers from the tropics to the Mediterranean up to the Baltic Sea.