The Groupers Nest is an advanced dive site in Attica, Greece, featuring a reef and wall structure that descends to depths of 35 to 40 metres. With an average depth of 38 metres, this site requires boat access and is suited for experienced divers comfortable with deep diving. Visibility varies between 10 and 30 metres, while currents remain mild. Due to the significant depth, nitrogen narcosis is a primary hazard, necessitating careful dive planning and conservative bottom times. Divers should monitor their mental clarity throughout the descent and maintain strict adherence to no-decompression limits during the typical 25-minute dive profile.

The Portugal wreck is a deep-water site located 200 metres off the coast of Attica, Greece. Resting at depths between 24 and 40 metres with an average of 30 metres, this wreck requires advanced diving skills and careful bottom time management. Divers access the site by boat. Conditions include moderate currents and visibility ranging from 12 to 30 metres. The structure provides a habitat for various reef fish and invertebrates typical of the region. Due to the depth, divers must monitor no-decompression limits closely throughout the 40-minute average dive. Water temperatures fluctuate between 16C and 23C depending on the month.

Profitas Illias in Attica, Greece, features a combination of shallow reef and a wall that descends to 30 metres. With an average depth of 15 metres and mild currents, the site is suitable for beginner divers. Visibility ranges from 5 to 20 metres. Divers should be aware of boat traffic in the area and must use a surface marker buoy upon ascent. The site is accessible by boat, and night diving is permitted. Divers can expect to encounter octopus, snowflake moray, scorpionfish, honeycomb grouper, sea bream, yellowtail damselfish, nudibranchs, and sponges.

The Little Island is a boat-access reef dive located in Attica, Greece. The site features depths ranging from 15 to 20 metres, with an average depth of 18 metres, making it suitable for beginner divers. Divers can expect mild currents and visibility that varies, so checking local conditions with your boat operator is recommended. The reef environment supports a variety of Mediterranean reef fish and invertebrates. Night diving is available at this location, offering a different perspective of the reef compared to daytime visits. A typical dive at this site lasts approximately 45 minutes.

Makris Reef in Attica provides a straightforward reef diving experience suitable for beginners. The site features depths ranging from 15 to 25 metres, with an average depth of 20 metres. Access is exclusively by boat. Divers can expect mild currents and visibility typically between 10 and 25 metres. Water temperatures fluctuate throughout the year, ranging from 16C in winter to 25C in August. Due to active boat traffic in the area, divers must deploy a surface marker buoy before ascending. Maintain controlled buoyancy to avoid contact with the sharp coral and rock structures present across the reef.

Makronisos south reef features a combination of reef structures and canyon terrain, offering a varied underwater landscape for intermediate divers. The site reaches depths between 15 and 30 metres, with an average depth of 20 metres. Divers can expect mild currents, with the canyon walls providing occasional shelter. Visibility at the site ranges from 10 to 30 metres, though it can fluctuate based on local weather conditions. Boat access is required to reach this location, and divers should coordinate entry and exit procedures with their boat operator. Typical dives at this site last approximately 45 minutes.

Kabouri in Attica, Greece, offers a diverse underwater topography featuring reefs, walls, caves, and canyons. Accessible only by boat, the site provides depths ranging from 10 to 30 metres. Divers can expect mild currents and visibility between 10 and 25 metres. The site is suitable for beginners and supports night diving, with typical dives lasting 45 minutes. Water temperatures fluctuate throughout the year, ranging from 15C in the winter months to 25C in August. Facilities available nearby include parking, a dive shop, air fills, and equipment rental. Divers should remain aware of boat traffic and depth limitations while exploring the submerged rock formations.

The Roza Vlassi is a technical wreck dive located 2400 metres off the coast of Attica, Greece. Resting at depths between 51 and 62 metres, with an average of 58 metres, this site is strictly for experienced technical divers. The wreck presents a challenging environment with moderate currents and visibility typically ranging from 5 to 10 metres. Due to the significant depth, divers must manage risks including nitrogen narcosis and the requirement for staged decompression stops. Access is by boat only, and the use of a surface marker buoy is essential for safe recovery. Divers should confirm sea conditions with local operators before departure.