Koh Ngai is a reef site in the Andaman Sea suitable for beginners and those new to underwater exploration. The reef lies at depths between 8 and 16 metres, with an average depth of 9 metres. Divers and snorkellers experience mild currents and visibility ranging from 5 to 10 metres. The site supports a variety of reef fish and invertebrates typical of the region. Access is available from both shore and boat. Night diving is permitted. Facilities on site include parking, toilets, showers, changing rooms, a rinse station, equipment rental, and air fills. Be aware of sharp coral and rocks throughout the reef, and note that visibility can change quickly.

Koh Waen at Koh Haa offers a diverse underwater environment featuring a natural reef, a wreck, and an artificial reef structure. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 15 metres. The site is accessible by boat and is suited for intermediate divers due to moderate currents and potential overhead environments within the wreck and swim-through sections. Visibility varies between 5 and 20 metres. The habitat supports a variety of reef fish and invertebrates. Night diving is permitted, providing opportunities to observe macro life such as crabs, shrimp, and nudibranchs among the hard coral formations.

The Emerald Cave at Koh Haa features a distinctive cavern swim-through that leads to a hidden lagoon. This site is suitable for beginners, with depths ranging from 8 to 12 metres and mild currents. Visibility varies between 10 and 30 metres, and water temperatures remain warm throughout the year. Access is by boat, and divers should be prepared for an overhead environment within the cavern. Hazards include boat traffic, surge, and sharp coral on the surrounding reef walls. A torch is recommended for the low-light swim-through section. Divers should monitor for jellyfish and ensure they remain close to their guide while navigating the cavern.

The Koh Kraden Wreck is a dedicated advanced dive site located 20 kilometres from shore near Koh Haa. Resting at depths between 24 and 26 metres, the wreck requires solid buoyancy control and comfort in overhead environments. Visibility is typically 5 to 10 metres, often affected by a thermocline below 15 metres. Divers must be prepared for mild currents that can strengthen quickly. Access is by boat only, and a torch is recommended for exploring interior sections. Due to loose lines and debris within the structure, divers should remain streamlined to avoid entanglement risks. Always confirm current conditions with your dive operator before descending.

Koh Haa offers diverse underwater topography, featuring a combination of reefs, walls, pinnacles, caverns, and wrecks. This site is suitable for intermediate divers, with depths ranging from 5 to 60 metres and an average depth of 20 metres. Visibility varies between 10 and 40 metres, and water temperatures remain consistent between 29 and 31 degrees Celsius. Access is by boat only, located 30 kilometres from shore. Divers should be prepared for moderate currents that can shift quickly. Due to the depth range and potential for strong currents, careful monitoring of air and bottom time is essential. Protective clothing is recommended to mitigate the risk of jellyfish stings.

Hin Nok is a submerged pinnacle located at Koh Haa, Thailand. The site features a reef structure ranging from 10 to 16 metres in depth, with an average depth of 14 metres. Access is by boat only. Divers should be aware of moderate currents and maintain precise buoyancy control to avoid contact with sharp staghorn coral and rocky surfaces. Visibility typically ranges between 10 and 20 metres. The site is suitable for beginners with an Open Water certification. Water temperatures remain consistent, ranging from 29C to 31C throughout the year.

Ko Rok Yai is a reef and muck site located in the Andaman Sea, forming part of the Ko Rok islands. The site features a reef extending along the southeast coast, offering depths ranging from 5 to 35 metres with an average of 12 metres. Conditions are generally suitable for beginners, with mild currents and visibility between 10 and 30 metres. Water temperatures remain consistent, typically between 29 and 31 degrees Celsius. Access to this site is by boat only, with a typical dive duration of 50 minutes. The area is protected by a National Park and provides facilities including toilets, showers, and a cafe.

Koh Rok is a diverse marine site located near Koh Haa, Thailand, offering a mix of reef, muck, drift, and cave topography. With depths ranging from 5 to 25 metres and an average of 12 metres, the site is suitable for beginners. Access is by boat only, situated 20 kilometres from the shore. Conditions include mild currents and visibility between 5 and 30 metres. Water temperatures remain consistently warm, between 29 and 31 degrees Celsius. Divers and snorkellers should be aware of potential hazards including boat traffic, jellyfish, lionfish, sharks, sea urchins, sharp coral, and strong currents. Night diving is available at this location.