Kind: captions Language: en Vesuvius isn't the biggest or most powerful volcano in town on the other side of the city scientists have seen an alarming increase in volcanic activity pelli a vast feral a vent of bubbling gas and mud in recent years it has grown larger and turned into a destroyer a few hundred fet away expert in volcanic risk Antonio Costa is visiting a deserted Building inside the walls and floors are covered in a thick layer of solidified ooze and the air is filled with the acurate smell of sulfur the volcanic vent has claimed the entire building this hostile takeover began when gas from the vent punched holes through the floor and walls here you can even feel if you put the hand here ah it's terribly hot as the gas cools it releases dissolved minerals these stick together to form the thick volcanic scum which is now consuming the entire house so where is the volcano that is driving all this activity the vent is in an area called campy flra which is home to hundreds of thousands of people at first glance it's hard to spot the volcano unless you have a trained eye good yeah to take a better look at the lay of the land Chris needs to take to the air a monitor connected to a drone provides him with a bird's eyee view of campy F so the first thing you notice from up in the air is as we come round to the Shoreline towards the Bay of Naples we start to pick up a prominent Ridge line it comes all the way round towards the main city center it's clearly curved and then within there it's a very densely populated flat area here this Ridge line could be telling us something about a feature that is actually forming this landscape an ancient very large volcano and in particular we're actually looking at a Caldera a Caldera is a collapsed [Music] volcano in the past campy flra was a flat plane deep beneath was a huge reservoir of bubbling magma then the magma started moving upwards smashing through weaknesses in the Rock and erupting powerfully but this left an empty void beneath the surface with nothing left to support the weight of the plane it collapsed downwards forming a crater known as a Caldera radioactive dating of rocks reveals that campy flra Caldera formed 15,000 years ago and at nearly 8 mil wide it must have been created by an incredibly large and Powerful eruption