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Cruise ships, cargo ships or supertankers... They are made of steel and weigh tens of thousands of tons, and yet they float! How do they manage not to sink, to withstand storms and the weight of their cargo? And what force is capable of propelling such monsters? By visiting the Chantiers de l'Atlantique in Saint Nazaire, we discover how these ships are built, how they are designed and studied to withstand all seas.