The earth floats on a sea of fire: the thin layer of the earth's crust, in fact, rests on an incandescent magma which every now and then finds chimneys to shoot out its fiery splashes: volcanoes. The entire planet is crossed by large fractures, along which volcanoes nestle. Ulisse, through a series of films and documents, will show the most extraordinary images of eruptions all over the world: from South America to Japan, from Africa to Canada, and of course Europe. Alberto Angela went, among other things, to Iceland, a large island that emerged from the sea, millions of years ago, following a gigantic eruption, and which is still today one of the most active volcanic areas: a third of all the lava material erupted in the last 500 years in the world is found in Iceland. A land where hot water springs now power the heating of homes and even greenhouses, where bananas are grown (and we are at the Polar Circle).