Seagrass holds a pivotal role on our planet, not just as the largest reserve of sugar but also as a protector of beaches from erosion and a purifier of water, functioning similarly to a sewage treatment plant. This plant, unique in its ability to live for nearly 80,000 years, surpasses the lifespan of any other living creature on earth. Serving as both a nursery and habitat, seagrass supports a myriad of marine species, contributing significantly to the biodiversity of our oceans. Its capacity to purify sea water mirrors the efficiency of a gigantic sewage treatment facility, highlighting its importance in maintaining the health of marine ecosystems. Furthermore, seagrass possesses the remarkable ability to aid in mitigating the effects of global warming, showcasing its environmental superpowers. This documentary traces the journey of leading seaweed researchers as they explore the significance of seagrass across various regions, from the Mediterranean to the Baltic Sea. Their work illuminates the crucial role that seagrass plays in our environment and underscores the necessity of preserving this vital marine plant for the health of our planet.