A decommissioned submarine faces its final dismantling. To save it, its former crew appeals to a museum far inland, triggering a near-impossible odyssey: 500 tons, 50 meters long, nine meters high, traveling across seas, rivers, highways, tight streets, sharp curves, cities and villages. The film captures this final voyage in powerful images, unfolding through the striking landscapes of the Netherlands and Germany, and portrays the people who come together to make the impossible possible.