It was April 14, 1912, when the Titanic, the largest passenger ship ever built by man, collided with an iceberg and sank, during its maiden voyage, on the route between Southampton and New York, causing the death of over fifteen hundred people including passengers and crew members. Alberto and Piero Angela dedicate a special episode of Ulisse, il piacere della scoperta, to the centenary of the greatest naval tragedy that has ever occurred. Through sophisticated virtual reconstruction techniques, videos, interviews and archive documents, father and son will delve inside the ocean liner, to try to find the possible clues that caused this catastrophe, beyond the collision with the iceberg, since from its construction in the Belfast shipyards, the materials used, the risky choices for navigation, such as that of equipping the ship with a lower number of lifeboats than there are passengers.