The Greek islands became known as a scuba diving destination when the government lifted an embargo a few years back. Previously, there was concern that divers might take any ancient artefacts they found. Some areas are still restricted but many of these islands now have dive centres.
Some say the Mediterranean is "fished out" and perhaps it is compared to destinations like the Red Sea. However, from the moment you drop below the surface, you see lots of small fish. There are hermit crabs, morays and octopus, even an occasional nudibranch. The topography is varied with rocky reefs, steep pinnacles and seagrass beds. There are excellent cave dives where you can ascend inside a chamber to see the stalactites.
Antiparos is also location of the MS Express Samina. This ferry went down in 2000 with the loss of 82 people but the vast majority were saved. The vessel now lies on it's side at 35 metres. You can penetrate a few areas and see a discarded lifeboat, rows of seats and the remains of a bathroom.