The protagonist of this episode is the air. You cannot see it, it has no smell or taste, but it is the most abundant element on the earth's surface and is crucial for our survival. In fact, air, by penetrating our lungs, provides our body with oxygen that allows us to move, speak and even think and profoundly influences plant and animal life. Alberto Angela will take us on a long journey inside the air, making us discover the most surprising aspects of this substance. On board a vintage sailing ship, Alberto Angela will explain to us how the use of wind has changed the history of humanity, from the great geographical discoveries to the latest technological evolutions of racing catamarans. We will discover the extreme limits of life without air: the possibility of remaining without breathing underwater for up to half an hour, as Umberto Pellizzari, the freediving record holder, will explain to us.