Punta Omo Morto is a reef and wall site in Ustica, Italy, characterised by large pyroclastic rock blocks along a slope. Divers typically explore between 20 and 30 metres, with an average depth of 25 metres. The site features colourful gorgonians and provides habitat for groupers. Marine life observed here includes bream, wrasses, Turkish wrasse, Cleaver wrasse, Mediterranean cardinalfish, painted comber, Madeira rockfish, hermit crabs, purple sea stars, fireworms, and mauve stingers. Nudibranchs such as Cratena slug and Mediterranean violet aeolid are also present. Access is by boat only, and divers should be aware of boat traffic and depth. Visibility reaches up to 40 metres, with mild currents.

Punta Falconiera is a diverse dive site on the eastern side of Ustica, Italy, offering a varied topography of walls, reefs, and caves. Accessible only by boat, the site features depths ranging from 10 to 42 metres, with an average depth of 24 metres. A notable cave is located at a depth of 20 metres. Divers should expect moderate currents and visibility between 15 and 30 metres. Water temperatures range from 15C to 20C. This site is suitable for intermediate divers and supports night diving. Due to the depth and overhead environments, divers must manage risks associated with nitrogen narcosis and sharp coral.

Scoglio del Medico in Ustica, Italy, is a diverse marine site featuring volcanic topography including canyons, caves, walls, and pinnacles. Located 500 metres from shore, this site requires boat access and is suited for intermediate divers. Depths range from 10 to 35 metres, with an average of 30 metres. Divers may encounter species such as Great Barracuda, Mediterranean Moray, European Parrotfish, Groupers, Rock Cod, Wrasses, Flat Crab, Castagnole, Two-banded Seabream, Sea Hare, Purple Sea Star, Madeira Rockfish, Bream, and Painted Comber. Visibility varies between 10 and 35 metres. Be aware of overhead environments and moderate currents when planning your dive.

Scogli Piatti in Ustica is defined by its large, flat volcanic slabs that provide easy shore access for snorkellers. The site features a shallow seabed with depths ranging from 1 to 5 metres, averaging 3 metres. Visibility is variable, typically between 10 and 30 metres. Snorkellers can observe a variety of marine life, including common wrasses and less frequently encountered species such as Great Barracuda, Mediterranean Moray, European Parrotfish, and various groupers. Other inhabitants include rock cod, Turkish Wrasse, bream, Painted Comber, Madeira Rockfish, Sea Hare, Purple Sea Star, Castagnole, and Two-banded Seabream. Conditions are generally mild, making this a suitable location for beginners.

Grotta Azzurra in Ustica is a marine cave and reef site accessible by boat, located 500 metres from the shore. The site features a large sea cave where sunlight creates a distinct blue glow within the water. Snorkellers can explore the interior of the cave and the surrounding volcanic walls. Conditions are generally suitable for beginners, with mild currents and depths ranging from 5 to 25 metres, averaging 10 metres. Visibility varies between 6 and 25 metres. Water temperatures fluctuate throughout the year, ranging from 15C in winter to 28C in August. Hazards at this site include sea urchins and sharp coral.

Cala Sidoti is a shore-access reef located within the integral reserve of Ustica. The site features a shallow volcanic pebble seabed with depths ranging from 1 to 10 metres, averaging 5 metres. It is well-suited for beginners and offers a high-quality snorkelling experience. Conditions are generally mild, though visibility varies between 5 and 20 metres. Water temperatures fluctuate significantly throughout the year, ranging from 15C in winter to 28C in August. Divers and snorkellers should be aware of sea urchins present in the area. Equipment rental is available nearby to support visitors.

Grotta delle Stalattiti in Ustica is an expert-level cave dive featuring significant geological formations. Divers access the site by boat to explore chambers containing stalactites and stalagmites, including a large formation known as The Palm Tree. The site involves an overhead environment where the entrance may be lost from view within the tunnel system. Depths range from 14 to 20 metres, with an average of 12 metres. Conditions include mild currents and water temperatures varying between 15C and 25C. Marine life recorded at the site includes bream, wrasses, European parrotfish, and various invertebrates such as the Mediterranean violet aeolid, Cratena slug, and purple sea star.

Cala Giacone is a reef and pinnacle site located 300 metres off the coast of Ustica, Italy. It is distinguished as the only location in the area featuring a significant sandy bottom, which supports a distinct ecosystem compared to surrounding rocky sites. Divers can explore depths ranging from 4 to 22 metres, with an average depth of 18 metres. The site is suitable for beginners and experiences mild currents. Access is by boat only, and the site is also suitable for night diving. Species recorded around this area include wrasses, Mediterranean morays, common octopuses, and great barracuda, alongside various nudibranchs and crustaceans.