La disparition Du Train Zanetti [The Disappearance Of The Zanetti Train]

In 1911, the Zanetti luxury train disappeared into a tunnel from which it never emerged, while it was making its inaugural journey between Rome and Milan. No trace of the train or its 104 passengers has ever been found. The Secrets Hunters agency sends you just after the train enters the tunnel to explore the area. Can you find out what happened to the train and its passengers?