God's Cave in Rethymno, Greece, is a boat-access cave dive suitable for intermediate divers. The site features an overhead environment at depths between 20 and 30 metres, with visibility ranging from 10 to 30 metres. Inside the cave, a halocline layer creates a shimmering visual distortion, requiring divers to move slowly. As this is an overhead environment, maintaining awareness of the exit route and monitoring air supply is essential. Divers should carry both primary and backup torches, as natural light diminishes rapidly within the cave. The surrounding marine habitat supports various reef fish and invertebrates typical of the region. Currents at this site are generally mild.

Elephant Cave in Rethymno is a submerged cavern featuring two distinct domes adorned with stalactites and stalagmites. Divers can observe fossilised elephant remains within the cave structure. The site is reached by boat and is suitable for intermediate divers, with depths ranging from 10 to 16 metres and an average depth of 10 metres. Conditions include mild currents and visibility between 10 and 30 metres. The water temperature fluctuates seasonally from 16C to 26C. Due to the overhead environment and potential for low visibility, this site requires appropriate cave diving experience. The habitat supports a variety of Mediterranean reef fish and invertebrates.

Cement Mixer Wreck, located on the right side of Koutalas Beach in Rethymno, offers a diverse underwater environment for beginners. This shore-entry site features a wreck, a cave, a wall, and a reef, with depths ranging from 3 to 20 metres. Visibility is consistently around 30 metres, providing clear views of the topography. Divers should be aware of sea urchins on rocky surfaces during entry. The cave presents an enclosed overhead environment; stay near the entrance unless specifically trained for cave diving. Currents are variable, so check conditions before entering. Parking is available on-site, and guided tours are offered to help divers navigate the layout.

Karga Island is a boat-access reef located off the coast of Rethymno, Greece. The site features depths ranging from 5 to 12 metres, with an average depth of 5 metres, making it suitable for beginner divers. Visibility is consistent at 30 metres, and currents are generally mild. The site is accessible only by boat, and night diving is available for those interested in exploring the reef after dark. Typical dives last approximately 45 minutes. Water temperatures fluctuate throughout the year, ranging from 16C in February and March to 26C in August and September.

Omprogialos Beach in Rethymno, Greece, features a reef accessible via both shore and boat entry. The site is suitable for beginners, with depths ranging from 6 to 25 metres. Visibility at the site typically spans 10 to 30 metres. Divers and snorkellers should be aware of potential strong currents and surf conditions. The site is open for day and night diving, with a typical dive duration of 45 minutes. On-site facilities include parking, toilets, and a cafe, providing convenient support for visitors before and after their time in the water.

The Airplane wreck at Kalami is a deep-water site located off the coast of Rethymno, Greece. Resting at depths between 24 and 40 metres, this wreck is accessible via a shore entry. The site features a combination of wreck, reef, and muck topography. Divers must be prepared for moderate currents and variable visibility ranging from 10 to 30 metres. Due to the depth and the overhead environment presented by the wreck structure, this site is strictly for advanced divers with appropriate training. Proper planning for decompression obligations and gas management is essential for this dive.

Limni Kournas is a freshwater lake dive site in Rethymno, Crete, offering shore access to a reef environment. Divers can explore depths ranging from 4 to 17 metres, with visibility typically between 5 and 15 metres. The site is suitable for beginners looking to practice skills in a controlled environment. A thermocline is present, and divers should be aware that surge and swell can occasionally make the shore entry challenging. It is recommended to observe water movement before entering. Facilities at the site include parking, a cafe, and toilets, supporting a typical dive duration of 40 minutes.

Cathedral Cavern in Crete is a marine cave system featuring stalactites and stalagmites, evidence of its existence above water during Minoan times. The entrance lies at 14 metres, with the site reaching depths between 14 and 21 metres. Divers encounter a halocline effect and temperature fluctuations caused by freshwater pools within the cavern. Light beams penetrate the overhead environment, creating distinct visual effects. Access is by boat, located 500 metres from the shore. Conditions include mild currents and visibility ranging from 13 to 40 metres. Hazards include the overhead environment, low visibility, thermoclines, and the presence of lionfish. Species recorded around this area include Turkish Wrasse, European Parrotfish, and various crustaceans.