Therma Hot Springs in Kos, Greece, is a unique geological site where volcanic hot springs flow directly into a sea pool. Divers and snorkellers experience significant thermoclines as the hot spring water, reaching temperatures between 40 and 50 degrees Celsius, mixes with the cooler sea water. The site features an artificial reef structure with an average depth of 3 metres, ranging from 1 to 5 metres. Access is via the shore, and the site is suitable for beginners. Conditions include mild currents and visibility between 3 and 10 metres. Hazards include surf and strong thermoclines. A cafe is available on-site for visitors.

Kos Reef is a boat-accessible site in Greece suitable for beginners and those building underwater confidence. The reef topography features shallower sections at 8 metres, sloping to a maximum depth of 25 metres, with an average depth of 15 metres. Divers typically spend 40 minutes exploring the site, which offers visibility ranging from 10 to 25 metres. Conditions are generally calm with no significant current. Boat traffic is a potential hazard, and divers should be mindful of sea urchins on the reef. Facilities including equipment rental, air fills, and showers are available nearby. Confirm departure times with local operators before arrival, as boat access is required.

Agios Fokas (Rocks) is a reef site located on Kos, Greece, characterised by a pebbly beach entry and large underwater boulders. The site offers depths ranging from 5 to 18 metres, with an average depth of 12 metres. Conditions are generally suitable for intermediate snorkellers, though divers should be aware of potential surf and deep water. Visibility at the site typically fluctuates between 10 and 30 metres, and currents are generally mild. Facilities including showers and toilets are available for visitors. The site is well-suited for a 45-minute excursion, providing a varied underwater topography of boulders and rocky structures.

Thor Star is a wreck and artificial reef located off the coast of Kos, Greece. The site offers a depth range of 5 to 30 metres, with an average depth of 15 metres. Divers access the site by boat, encountering mild currents and visibility ranging from 15 to 30 metres. The wreck presents an overhead environment with potential hazards including entanglement and sharp structures. Water temperatures at the site fluctuate between 17C and 23C throughout the year. A typical dive at this location lasts approximately 40 minutes. The site is suitable for beginner divers.

Trigger Reef in Kos, Greece, is a reef site accessible only by boat. The topography features a reef meeting a sandy bottom at a maximum depth of 14 metres, with an average depth of 12 metres. Divers typically experience mild currents and visibility ranging from 15 to 40 metres. The site is suitable for beginners and offers a relaxing 45-minute dive profile. Water temperatures fluctuate between 17C and 25C throughout the year. Due to the nature of the location, divers should remain aware of potential boat traffic in the area.

Cave Island near Kos offers a varied underwater topography featuring plateaus, walls, and drop-offs. Divers typically navigate the site in a circular route, crossing ridges that lead to drop-offs starting at 20 metres and extending to 50 metres. Located 500 metres from shore, this site requires boat access and is suited for intermediate divers due to moderate currents and overhead environments. Visibility ranges from 15 to 30 metres, with water temperatures between 17C and 21C. The site is characterised by its deep sections and drift conditions, requiring careful management of depth and currents during the typical 45-minute dive.

Strongyli island is a volcanic site near Kos, Greece, characterised by a cone-shaped topography that drops rapidly into deep water. The site features both a wall and a wreck, offering a varied underwater landscape for advanced divers. Depths range from 3 to 40 metres, with an average depth of 15 metres. Access is strictly by boat due to the distance from shore. Divers should be prepared for strong currents and potential entanglement hazards. Visibility can reach up to 30 metres, and water temperatures fluctuate between 17C and 21C throughout the year. Given the challenging conditions and depth, this site is suitable only for experienced divers.

Kargı Island, specifically the Bubble Cave Area, is defined by dramatic spear-like rock formations and a vertical wall. This site is suitable for advanced divers due to the strong currents encountered here. The topography includes a reef and wall structure, with depths ranging from 15 to 36 metres and an average depth of 25 metres. Access is exclusively by boat, as the site is located 1000 metres from the shore. Visibility is generally good, typically between 15 and 30 metres. The water temperature fluctuates between 17C and 22C throughout the year.