Berlenga Grande offers a diverse underwater environment featuring reefs, walls, caverns, and wrecks. Located in the Berlengas Archipelago, this site requires boat access and is suitable for experienced divers due to potential strong currents, surf, and overhead environments. Depths range from 5 to 40 metres, with an average of 25 metres. Visibility varies significantly between 6 and 30 metres, and water temperatures remain cool, fluctuating between 15C and 18C throughout the year. Divers should be aware of boat traffic in the area. Facilities including equipment rental, air fills, and boat charters are available to support diving activities at this location.

Recife dos Galos is a reef and artificial reef site located off Berlenga Grande. Divers can explore depths ranging from 5 to 22 metres, with an average depth of 20 metres. The site is accessible only by boat and is suited for advanced divers due to moderate to strong currents. Marine life includes common sightings of wrasses, flatworms, and Tompot Blenny. Uncommon species such as Common Octopus, European Common Cuttlefish, Comber, and nudibranchs like Felimare villafranca and Felimare fontandraui are also present. Rarer encounters include gurnard, squat lobster, scorpionfish, slipper lobster, and the tricolor doris. The site features slopes where John Dory are frequently observed sheltering among the algae.

Gruta Lagosteira is a sea cave located at Berlenga Grande in the Berlengas Archipelago. This site offers a distinct cave environment with depths reaching up to 12 metres. Access is exclusively by boat, and the site is suitable for beginners due to the mild currents. Divers should be prepared for variable visibility and lower light conditions within the cave structure. Water temperatures range from 15C to 19C throughout the year, necessitating the use of a wetsuit. As this is a cave environment, divers must exercise caution, remain within their comfort zone, and avoid contact with the cave walls or any marine life encountered.

Baía do Forte is a reef and cave site located at Berlenga Grande in the Berlengas Archipelago. The site features a reef structure and the Lagosteira cave, which presents an overhead environment for divers. Depths range from 5 to 13 metres, with visibility typically between 10 and 30 metres. Access is by boat. Water temperatures fluctuate between 15C and 19C throughout the year. Due to the presence of sea urchins, caution is advised. The site is suitable for intermediate divers and offers excellent conditions for snorkelling.

Vapor do Trigo is a wreck dive located off Berlenga Grande, resting at depths between 27 and 30 metres. This site requires boat access and is suited for intermediate divers due to the moderate to strong currents that can build quickly. Visibility ranges from 5 to 10 metres, requiring careful navigation to explore the structure. Water temperatures fluctuate between 15 and 18 degrees Celsius, making a 5mm wetsuit or drysuit appropriate. Divers should prioritise precise buoyancy control and air management. Shore facilities at the boat departure point in Peniche include parking, toilets, showers, changing rooms, and a rinse station.

Parede do Relaxe is a wall and cave dive site located 1000m from the shore of Berlenga Grande. The site is accessible only by boat and is suitable for beginners. Divers can explore the wall and cave formations at depths ranging from 5m to 13m, with an average depth of 10m. Conditions include mild currents and visibility between 3m and 15m. Water temperatures are chilly, typically ranging from 15C to 19C throughout the year, so a 7mm wetsuit is recommended. A typical dive lasts 45 minutes.

Baía da Flandres, located at Berlenga Grande in the Berlengas Archipelago, offers a shallow dive and snorkel experience ranging from 4 to 15 metres. The site features a small wreck and a cavern, accessible only by boat. Divers and snorkellers can encounter common species such as wrasses, flatworms, and Tompot blennies. Less frequently, the site hosts Common octopus, European common cuttlefish, sea stars, and various nudibranchs like Felimare villafranca and Felimare fontandraui. Scorpionfish, squat lobsters, slipper lobsters, and tricolor doris are occasionally recorded. With mild currents and visibility between 10 and 30 metres, this site is suitable for beginners. Water temperatures fluctuate between 15C and 19C throughout the year.

Cova Do Sono is a diverse marine site located at Berlenga Grande in the Berlengas Archipelago. The site features a combination of reef, cave, wall, and cavern topography, offering varied underwater structures to explore. Depths at this location range from 2 to 12 metres, with an average depth of 6 metres. Conditions are generally mild, with visibility typically between 10 and 15 metres. Access to the site is by boat only, as it is situated 10 kilometres from the shore. The site is suitable for beginner divers. Divers should remain aware of boat traffic in the area. Facilities including changing rooms, showers, and a rinse station are available.