East of Naples off the coast of Pozzuoli, the snorkeling in the Parco Archeologico Sommerso di Baiae is popular for exploring the submerged ancient city from the 16th century. The Parco Archeologico Sommerso di Baiae snorkeling is in about 15 feet deep water where you can still see the leftover sculptures and marble mosaic floors. In the 16th century, there was volcanic activity which submerged the old coastline.
To reach the snorkeling at Parco Archeologico Sommerso di Baiae, you will need to charter a snorkel tour to the orange-buoy marked site about 1,200 feet off the coast of Pozzuoli.
One of the more popular sites within this complex is Portus Julius. Portus Julius was commissioned by Marcus Vipsanius Agrippa during the civil war between Octavian and Sextus Pompey (37 BC). The magnificent port was intended for the arsenal of the Classis Misenensis, the most important Roman fleet, and was connected to Lake Lucrine and Lake Avernus via a navigable canal. Today the structural ruins and several mosaics are visible at a depth of 9-15 feet.
Overall, Parco Archeologico Sommerso di Baiae is the 3rd most popular snorkel dive spot of all 17 snorkeling dives in Italy.