Ao Yui is a boat-access site in the Samae San Islands offering a mix of reef, drift, and muck diving. The site features a compact depth range of 5 to 12 metres, with an average depth of 8 metres. Divers encounter moderate currents that require solid buoyancy control and constant monitoring of position relative to the reef. Visibility varies between 3 and 10 metres, making it best to stay close to the substrate. The site is home to various nudibranchs, including Doto, Melibe, Costasiella, Janolus, and Bornella cf. adamii, alongside yellow and black seahorses found among hard coral formations.

Koh Rong Nang in the Samae San Islands offers a varied underwater experience featuring a reef wall and drop-off. The site reaches depths of 29 metres, with an average depth of 15 metres. Divers encounter moderate currents that can strengthen quickly, particularly along the wall, requiring good buoyancy control and situational awareness. Visibility ranges from 10 to 30 metres, and the site is accessible only by boat. With water temperatures between 28 and 31C, it is suitable for intermediate divers. Night diving is also available at this location. Guided tours and boat charters are recommended to navigate the changing conditions effectively.

The Hardeep, also known as the SS Suddhadib, is a shipwreck lying 300 metres off the Samae San Islands. This artificial reef sits at depths between 16 and 32 metres, with an average depth of 27 metres. Due to strong currents and potential overhead environments within the structure, this site is suitable only for advanced divers. Visibility is highly variable, ranging from 3 to 30 metres, and thermoclines are common below 20 metres. The site supports a variety of marine life typical of the region, including reef fish and invertebrates. Boat access is required for all dives, which typically last around 30 minutes.

Shark Fin Rock is a submerged pinnacle in the Samae San Islands that descends from the shallows to a maximum depth of 30 metres. The site features a variety of reef environments, with an average depth of 18 metres. Divers should be prepared for moderate currents that can increase quickly, including downward pulling currents near the pinnacle. Visibility is variable, ranging from 8 to 30 metres. This site is accessible by boat only. Due to active boat traffic, divers must deploy an SMB before ascending. The reef supports a variety of reef fish and invertebrates. Night diving is permitted at this location.

Harddeep Suthathip is a wreck and artificial reef located 300 metres off the Samae San Islands. This advanced dive site sits at depths between 16 and 29 metres, with an average depth of 27 metres. Divers should be prepared for strong currents and variable visibility ranging from 5 to 20 metres. Thermoclines are frequently encountered below 20 metres. Access is by boat only, and the site presents hazards including boat traffic, entanglement risks, and overhead environments. The habitat supports a variety of reef fish and invertebrates typical of the region. Due to the depth and current, this site is suitable only for experienced divers.

Samae San Islands offer a diverse underwater environment featuring reefs, wrecks, walls, and drop-offs. Located 8000 metres from shore, this site requires boat access and is suitable for beginners, with depths ranging from 5 to 28 metres and an average of 15 metres. Divers encounter moderate currents and visibility between 5 and 25 metres. The habitat supports a variety of reef fish and invertebrates typical of the Gulf of Thailand. Water temperatures remain warm throughout the year, ranging from 28C to 31C. Hazards include boat traffic, strong currents, and potential overhead environments in wreck areas. Guided tours and air fills are available locally.

Soldier’s Cabin Bay in the Samae San Islands offers a combination of reef and muck diving environments. Located 1500 metres from shore, this site is accessible only by boat. Divers can expect depths between 5 and 12 metres, with an average of 8 metres, making it suitable for beginners. Conditions are generally manageable with mild currents, though visibility fluctuates between 5 and 15 metres. The site features both sandy bottom areas and reef sections. Night diving is available and often recommended for observing nocturnal activity. Divers should remain cautious of boat traffic when surfacing and be mindful of sharp coral and rocks during the dive.

Boran Beach features a combination of natural reef and artificial structures located 6,000 metres from shore in the Samae San Islands. The site is suitable for beginners, with depths ranging from 2 to 13 metres and an average of 10 metres. Divers and snorkellers can expect mild currents and visibility between 5 and 15 metres. Access is by boat only. The artificial reef structures provide additional habitat for marine life, requiring careful navigation to avoid sharp coral and rocks. Typical dives last approximately 45 minutes. Divers should avoid touching the reef for stability and remain mindful of fin placement in shallower areas to prevent accidental contact.