This was a very difficult adventure to track down for some reason. They've done episodes on…read moreNational Geographic about this scuba diving excursion. It's an underwater city with perfectly preserved mosaic flooring. They have taken some of the artifacts and put in the museum and replaced them with replicas. They will also take you to an area where there are volcanic heat vents that you can feel through the sand. You can also visibly see the sulfur. These are relatively beginners level dives and they also over discover scuba. They only bad thing is it's very silty, so if you have bad divers, your viz will be shot. You will see a ton of cuttlefish! They are literally all over the place.

Having visited Pompeii in the past, I was always wanting to dive the "underwater version" - the…read moreCentro Sub Campi Flegrei is a very short boat ride from the archeological site. Their dive masters are VERY familiar with all of the artefacts and the layout of the underwater city ruins. They were extremely helpful (they have English-fluent staff) and accommodating for divers of all levels. They also offer snorkeling for non-certified. As a dive-shop, they also offer PADI certification classes (though I did not use them for this). The 2 or 3 different dives they off are beginner level dives. All of their staff were very helpful - for the Americans, remember that you're not in the USA and get used to living the more relaxed Italian lifestyle!