A 9300 km long track that passes through different landscapes: Michelangelo Pepe takes us on the Trans-Siberian, on a journey that starts from Moscow to Vladivostok and crosses seven time zones, introducing us to different peoples and cultures. The reportage to discover stories and people met "on the way" continues in the next episode. Sharks swam in the ocean long before man set foot on our planet: they have existed since time immemorial. This week's documentary is the true story of the shark, starting from the monsters of prehistory up to the sophisticated killing machines of today.