Red Beach in Santorini is defined by its dramatic volcanic topography, featuring towering iron-rich red cliffs that extend into the underwater environment. Divers and snorkellers can explore a landscape of volcanic boulders, small caverns, and wall formations. The site offers visibility ranging from 20 to 30 metres. Conditions are generally suitable for intermediate divers, though the area is subject to variable currents, surf, and overhead environments within the caves. Access is available via both shore and boat entries. On-site facilities include parking, showers, changing rooms, toilets, and a cafe.

White Beach in Santorini is defined by its striking white limestone cliffs and a seabed composed of white pebbles and dark sand. The site features several underwater caves and swim-throughs located along the base of the cliffs. Accessible only by boat, this location offers visibility ranging from 15 to 30 metres. Conditions are generally mild, though snorkelers should remain aware of boat traffic in the area and the presence of sea urchins on the seabed. With a snorkel rating of 3/5, this site is best suited for intermediate snorkelers comfortable with boat-based entries and variable water temperatures between 17C and 25C.

Mesa Pigadia in Santorini is a secluded cove defined by dark volcanic cliffs and traditional syrmata cave boat houses. The site features a mix of reef, cave, and artificial reef structures, offering a varied topography for divers and snorkellers. Depths range from 2 to 12 metres, with an average of 8 metres. Visibility typically spans 10 to 30 metres, though conditions vary. Divers should be aware of overhead environments within the caves and the presence of sea urchins. Moderate currents are common, making this site suitable for intermediate divers. Access is available via both shore and boat, with facilities including parking, a cafe, toilets, and boat charter services.

Small Harbor is a reef site in Santorini, Greece, offering a straightforward experience for divers. The site features depths ranging from 8 to 14 metres, with an average of 11 metres, making it suitable for beginners. Divers can access the reef via shore or boat entry. Visibility is consistent at 30 metres, and the absence of current allows for relaxed exploration. Water temperatures fluctuate between 17C and 25C throughout the year, with a 5mm wetsuit typically recommended. The site is accessible for night diving, and morning dives are often preferred for optimal light penetration and calmer surface conditions.

Mavro Vouno Caves offers a combination of open reef and cave exploration along the Santorini coastline. Accessible only by boat, the site features depths ranging from 5 to 30 metres with an average of 15 metres. Visibility typically spans 15 to 30 metres. The cave sections present an overhead environment requiring careful navigation, as surge can intensify within the entrances. Divers should maintain a neutral position and keep exit routes in sight. While the site is suitable for intermediate divers, experience with overhead environments is recommended. Species recorded around this area include Mediterranean moray, Turkish wrasse, white seabream, and various nudibranchs such as the Mediterranean violet aeolid.

Caldera Beach in Santorini offers a diverse underwater environment featuring a reef, wall, cave, and artificial reef structures. Located within the volcanic crater, the site provides a unique topography where the seabed drops off quickly. Depths range from 3 to 20 metres, with an average of 12 metres, making it suitable for intermediate divers. Access is via a shore entry, and visibility typically spans 20 to 50 metres. The site is well-supported by local facilities, including parking, a cafe, and a dive shop offering guided tours. Typical dives last around 50 minutes, and the location is also highly rated for snorkelling.

Caves in Santorini provides an accessible introduction to cave diving within the Aegean. Reached exclusively by boat, the site features a combination of shallow reef sections and cave formations with depths ranging from the surface to 13 metres. Visibility is typically between 20 and 30 metres, allowing divers to inspect cave openings before entry. The current is generally mild, making it suitable for beginners. As this is an overhead environment, divers cannot always ascend directly to the surface. It is recommended to dive with a guide, remain near the entrance until comfortable with the layout, and monitor air consumption closely throughout the 30-minute dive.

3 Rocks is a shallow reef site in Santorini, Greece, featuring rock formations at depths between 5 and 10 metres. With an average depth of 8 metres, it is well-suited for beginner divers. Visibility typically ranges from 10 to 30 metres, though conditions vary. Divers may access the site via shore or boat entry. Currents are generally mild but can shift without warning, making local consultation regarding conditions advisable before entry. Water temperatures fluctuate throughout the year, ranging from 17C in the cooler months to 25C during the summer. Typical dives at this location last approximately 30 minutes. Hazards to be aware of include jellyfish, lionfish, and sea urchins.