With Alberto Angela at the Archaeological Museum of Naples, where the beautiful collection of bronze statues discovered in the Villa of the Papyri will be the excuse to return to Herculaneum beneath the ashes of Vesuvius. Paolo Magliocco and Francesca Marcelli descended with speleologists and our crew into the Bueno Fonteno caves on Lake Iseo: a precious and unknown underground world. This abyss, a collection of enormous and fascinating karst cavities, rich in water reserves, was recently discovered. A report on the Italian Army's bomb disposal team, where we'll see how old unexploded bombs as well as state-of-the-art devices are cleared, will be followed by an "explosive experiment" in Paco Lanciano's studio. The printed steak: Using new plant-based proteins and a 3D printer, it's possible to produce a new type of meatless steak.