Siaes Cave is a deep-water site in the Rock Islands featuring a combined cavern and wall system. The topography ranges from 20 to 60 metres, with an average depth of 35 metres. Divers encounter an overhead environment that requires strict decompression management and awareness of nitrogen narcosis risks. Visibility typically spans 20 to 40 metres. Access is by boat only, and the site is suited for advanced divers. While conditions are generally mild, currents can shift unexpectedly, necessitating careful tide monitoring and the use of a surface marker buoy. Penetration of the cave requires specific cavern or cave certification beyond standard advanced training.

Ulong Channel is a high-energy drift dive located in the Rock Islands of Palau. This reef passage features a wall ranging from 3 to 20 metres in depth, with an average of 10 metres. Divers experience strong currents that funnel through the channel, requiring advanced buoyancy control to navigate safely past sharp coral formations and overhead structures. Visibility typically ranges between 15 and 30 metres. Access is by boat only, and the site is best suited for experienced divers capable of managing significant water movement. Divers should coordinate exit points with their boat crew prior to entry to account for the swift flow.

Sand Bar is a reef dive located within the Rock Islands of Palau, offering a manageable depth range of 4 to 13 metres. This site is accessible by boat and suits beginner divers. Visibility typically ranges from 6 to 18 metres. Divers may encounter whitetip reef sharks, giant morays, leaf scorpionfish, Clark's anemonefish, various wrasses, spotted garden eels, sea stars, moon wrasse, soldierfish, bigeyes, and sea cucumbers. Currents are variable, so consult your boat crew regarding conditions before entry. Water temperatures remain warm between 28 and 30 degrees Celsius, making a 3mm shorty or full suit appropriate for the typical 45-minute dive duration.

Shark City is an advanced wall and canyon system located on the outer edge of the Ngemelis Islands. The topography drops from 20 metres to depths exceeding 50 metres. Divers must contend with strong currents that define the site, requiring a negative entry from the boat and immediate descent. Visibility ranges from 10 to 40 metres depending on conditions. Due to the depth and potential for down currents, divers must monitor their computers closely to manage nitrogen narcosis and decompression limits. The site is strictly for advanced divers capable of handling significant current and deep water environments.

Ulong Island is a high-energy drift dive located in the Rock Islands of Palau. The site features a reef and wall system that drops to 18 metres, with an average depth of 8 metres. Divers experience strong currents, requiring advanced buoyancy control and drift diving experience. Visibility typically ranges from 15 to 30 metres, with water temperatures between 28 and 30C. Access is by boat only. Divers should remain aware of strong currents, sharp coral, and rock edges along the wall. Securing equipment is essential to prevent entanglement. It is recommended to dive on an incoming tide to manage current direction and reduce exposure to the wall.

Cemetery Reef is located within the Rock Islands of Palau, offering a shallow reef environment suitable for beginner divers. The site features depths ranging from 3 to 18 metres, with an average depth of 8 metres. Visibility typically spans 15 to 30 metres, allowing for clear observation of the reef structure. Water temperatures remain consistent between 29 and 30 degrees Celsius. Access is by boat only, and divers should be aware of mild currents. Hazards include sharp coral and rocks, as well as boat traffic, requiring careful attention during ascents. Species recorded around this area include various wrasses, groupers, angelfish, and reef sharks.

Paradies Corner is a shallow, calm reef environment located 1000 metres from shore within the Rock Islands. Accessible only by boat, the site features warm water temperatures between 29 and 30 degrees Celsius throughout the year. The reef structure provides a varied habitat suitable for newer divers, though visibility can fluctuate. Divers should consult with their boat crew regarding current conditions before descending, as shifts can occur with the tides. While the site is generally accessible, checking local conditions remains essential for a safe experience.

Mysterious Cave is a marine cave and cavern system located in the Rock Islands of Palau. The site features depths ranging from 5 to 30 metres, with an average depth of 20 metres. Divers access the site by boat. Conditions include mild currents and visibility typically between 15 and 30 metres, though visibility can shift significantly within the overhead environment. Water temperatures remain consistent between 28 and 30 degrees Celsius. Due to the overhead environment and potential for variable visibility, divers must maintain awareness of their surroundings and depth. The site is suitable for beginners, though specific cave access protocols and permit requirements should be confirmed with boat operators prior to arrival.