Baiae was a fashionable Roman spa with magnificent villas, including those of Caesar and Nero, near the present city of Naples. The greater part of the ancient city is, however, due to volcanic activity under the waters of the Bay of Naples. The region is very seismically active.
For thousands of years, earthquakes are coming here. The region is also known for the phenomenon called bradisismo – the regular lowering or increasing of the soil as a result of the filling or emptying of volcanic chambers located under the surface of the earth. It is thanks to the so-called the negative bradisismo, i.e. the collapse of the terrain, much of Baiae is underwater today.
Some of the ruins lie at a depth of only a few meters – here you only need a tube and a mask to “explore”. Other sunken locations can be seen diving with a tank or taking a boat trip with a specially adapted hull that allows observation of the bottom.