U-455 is a World War II German submarine located 3700 metres off the coast of Portofino. Resting at depths between 90 and 120 metres, this site is strictly for technical divers with trimix and rebreather experience. The wreck presents a complex overhead environment with significant entanglement risks within the pressure hull and internal spaces. Divers encounter moderate currents and visibility ranging from 10 to 20 metres. Water temperatures remain between 14 and 16 degrees Celsius. Due to the extreme depth and decompression requirements, this site demands advanced gas management and careful planning. Boat access is required to reach this location.

Scoglio Nave is a reef site located within the Portofino Marine Park, accessible only by boat. The site features a reef structure ranging from 5 to 16 metres in depth, with an average depth of 9 metres. Conditions are generally mild, though visibility can vary, making it advisable to check with local operators before diving. The site is suitable for beginners and offers opportunities for night diving. Divers can explore the rock surfaces and shaded overhangs, which provide habitat for various marine life including octopus, nudibranchs, sponges, peacock wrasse, and salpa. Typical dives last approximately 30 minutes.

The Relitto Haven is a significant wreck located in the Portofino Marine Park, resting at depths between 33 and 85 metres. This site is strictly for advanced technical divers, requiring trimix or rebreather certification due to the extreme depth profiles. Visibility is highly variable, ranging from 5 to 60 metres, with water temperatures typically between 14 and 16 degrees Celsius. Access is exclusively by boat, and divers must manage risks associated with entanglement within the wreckage. The site is suitable for night diving, where the structure becomes active with various invertebrates. Proper gear configuration and strict depth monitoring are essential for all descents at this location.

The Relitto dell'Ischia is a technical wreck dive located 500 metres offshore within the Portofino Marine Park. Resting at depths between 78 and 90 metres, the site requires advanced technical training and precise gas planning. Divers access the wreck by boat. Conditions include strong currents and visibility ranging from 10 to 30 metres. The water temperature remains between 14 and 16 degrees Celsius, making a drysuit necessary for thermal protection. Due to the overhead environment and potential for entanglement, this site is strictly for experienced technical divers. Local dive shops provide guided tours, air fills, and equipment rental to assist with safe navigation of the wreck structure.

Secca Isuela is a prominent sea mountain located 200 metres offshore in the Portofino Marine Park. This pinnacle rises from a depth of 60 metres to reach within 13 metres of the surface. The site features a wall and drop-off topography, requiring boat access for all dives. Conditions include moderate currents and surge, with visibility ranging from 10 to 25 metres. Due to the depth, potential for strong currents, and overhead environment, this site is suitable only for advanced divers. Water temperatures remain between 14C and 17C throughout the year. Guided tours are available to assist with navigation of this deep reef structure.

Grotta dei Gamberi is a technical dive site situated on the east side of Punta Chiappa. The dive begins at 18 metres near the mooring buoy, where the seabed consists of rock and posidonia. A vertical wall starts at 22 metres, dropping to depths between 35 and 46 metres. This site features a cave and canyon topography, requiring boat access. Divers should be prepared for moderate currents, low visibility, and overhead environments. Due to the depth and technical nature of the cave, this site is suitable for advanced divers. Water temperatures range from 14C to 18C throughout the year, with visibility typically between 15 and 30 metres.

Grotta dell'Eremita is a reef, wall, and cave site located in the Portofino Marine Park. Named after a local hermit who once inhabited a nearby land cave, the site features a topography filled with crevices. Divers can expect depths ranging from 18 to 30 metres, with an average depth of 20 metres. Access is by boat only. Conditions include mild currents, though strong currents can occur, and visibility typically ranges between 15 and 30 metres. Water temperatures fluctuate between 14C and 20C throughout the year. This site is suited for intermediate divers.

Secca Carega, also known as Gonzatti, is a pinnacle and wall site located off Portofino, Italy. The topography features a drop-off that descends from 5 metres down to a maximum depth of 40 metres, with an average depth of 18 metres. Access to this site is by boat only. Divers should be prepared for moderate currents and the potential for strong currents at depth. Visibility typically ranges between 15 and 20 metres. Given the depth and current conditions, this site requires careful planning and attention to safety. Water temperatures fluctuate between 14C and 18C throughout the year.