Story : The subsoil of Rome hides real treasures. In areas of the city where modern buildings stand, remains of the ancient Imperial City are discovered: streets, baths, walls and even rooms where the frescoes made by our distant ancestors have remained intact. Like in the tomb of a family of senators of ancient Rome, buried for centuries under a building in the Porta Latina district. Alberto Angela went to visit it. For the usual appointment with the documentary, the third episode of the BBC series "Blue Planet" dedicated to the Ocean will be proposed. This evening we will talk about the Arctic and Antarctic. Extraordinary images will make us discover the life of apparently deserted and unreal worlds, where only darkness and cold seem to dominate. Guest in the studio is the writer Carlo Lucarelli. With Piero Angela he will talk about his profession as an author of crime novels, some of which have become screenplays for successful films.