North Twin Plateau is a reef and pinnacle system located 1000 metres offshore in the Surin Islands. This site is suited to intermediate divers, with depths ranging from 5 to 35 metres and an average depth of 30 metres. Divers encounter strong currents, making boat access essential and drift diving common. Visibility varies between 10 and 30 metres, while water temperatures remain between 26 and 29C. The topography features a reef surface with sharp coral and rocks. The site supports a variety of reef fish and invertebrates throughout the structure. Night diving is available, and guided tours are recommended to navigate the current effectively.

Three Islets in the Surin Islands offers a diverse underwater landscape featuring a reef, wall, cave, and pinnacle. Divers can explore depths ranging from 5 to 40 metres, with an average depth of 25 metres. This site is suited for intermediate divers due to moderate currents that can shift quickly. Visibility typically fluctuates between 10 and 30 metres. Access is by boat only, and the site is also available for night diving. Hazards include potential entanglement, stonefish, and strong currents. Divers should maintain neutral buoyancy to avoid contact with the reef and keep equipment secured. Always confirm conditions with the boat crew before entry.

The Arch in the Mergui Archipelago is a complex site featuring a reef, cavern system, and drift diving. Divers navigate depths between 5 and 22 metres, with visibility ranging from 15 to 40 metres. Strong currents are common, particularly through the arch, requiring advanced buoyancy control and careful current monitoring. The overhead cavern environment necessitates the use of a torch and a planned exit. Water temperatures typically range from 27 to 30 degrees Celsius. The site is accessible by boat and supports night diving. Due to the strong currents and entanglement risks, divers should carry a surface marker buoy and a dive knife.

Three Sisters consists of three distinct underwater pinnacles and reef structures located in the Surin Islands. The site offers depths ranging from 5 to 30 metres, with an average depth of 18 metres. Divers encounter visibility between 10 and 30 metres. Access is by boat only, and the site is suited for intermediate divers due to the presence of swim-throughs, potential surge, and currents that can strengthen around the pinnacles. Divers should monitor air consumption closely in the deeper sections and remain near their guide. Water temperatures typically range from 26 to 30 degrees Celsius, though occasional thermoclines may occur.