On August 10, 1628, King Gustavus Adolphus was ready to show off Sweden's naval dominance with the Vasa, a grand warship armed with 64 bronze cannons. A crowd of thousands gathered in Stockholm to watch the vessel set sail. Minutes later, a light gust of wind pushed the ship onto its side.
Water rushed through the open lower gun ports, and the Vasa sank in plain sight, having traveled a comical 1,300 meters. For centuries, historians blamed the King's demand for extra gun decks, but modern archaeological digs uncovered a fascinating root cause: the builders were using different rulers. When archaeologists excavated the preserved hull in the 20th century, they found four measuring sticks used by the shipwrights.
Two were calibrated to Swedish feet (divided into 12 inches), while two were calibrated to Amsterdam feet (divided into 11 inches). Because different work crews constructed the left and right sides of the hull using their own preferred rulers, the ship was built inherently asymmetrical. The port side was literally thicker, heavier, and dimensionally different than the starboard side.
Combined with an overambitious weight burden from the King's massive cannons and a ballast bay too small to stabilize the top-heavy design, the lopsided hull geometry made the Vasa hopelessly unstable. The minute the wind tilted the vessel, its asymmetrical center of gravity made recovery impossible, turning Sweden's proudest flag ship into one of history's most expensive lessons in standardizing units of measurement.