Cayo Icacos offers a varied underwater landscape featuring a combination of reef, wall, and artificial reef structures. Located off Culebra Island, this site is accessible only by boat and is suitable for beginner divers. Depths range from 5 to 21 metres, with an average of 15 metres. Visibility typically spans 10 to 25 metres, and water temperatures remain between 27C and 30C throughout the year. While currents are generally mild, they can strengthen unexpectedly. Divers should remain vigilant for boat traffic at the surface and use a marker buoy during ascents. Hazards include potential jellyfish, sharp coral, and surf conditions.

Palomino's Wall features a combination of a shallow reef and a vertical drop-off, offering varied terrain between 5 and 24 metres. Divers typically experience mild currents, allowing for a relaxed pace along the wall face. Visibility ranges from 10 to 30 metres, with optimal light penetration occurring during mid-morning hours. Water temperatures remain consistent between 27 and 30 degrees Celsius throughout the year. Boat access is required for this site, and divers should coordinate logistics with local operators. Species recorded around this area include French Angelfish, Purple Sea Fans, Redband Parrotfish, Flamingo Tongues, Blue Tang, Stoplight Parrotfish, Peacock Flounder, Pacific Trumpetfish, Whiptail Stingrays, various wrasses, Yellowtail Snapper, combers, White Grunt, and Queen Conch.

The Trench is a reef site located off Culebra Island, Puerto Rico, accessible only by boat. The site features a consistent depth of approximately 8 metres, making it suitable for beginners. Divers and snorkellers can expect mild currents and visibility ranging from 5 to 15 metres. Water temperatures remain warm throughout the year, fluctuating between 27C and 30C. Typical dives last around 40 minutes. Hazards at this location include the presence of jellyfish and sharp coral. As a shallow reef environment, it offers a straightforward experience for those looking to explore the local marine topography.

Sand Slide is a marine site located off Culebra Island, Puerto Rico, characterised by two distinct sandy slopes and a reef running along one side. The topography offers a varied profile, with depths ranging from 5 to 24 metres. Access to this site is by boat only. Divers and snorkellers should be aware of moderate currents and the presence of sea urchins in the area. The site is suitable for various skill levels, with typical dives lasting approximately 45 minutes. Water temperatures remain warm throughout the year, fluctuating between 27C and 30C.

Palominito's Wall and Sandslide is a marine reef and wall site located off Culebra Island. Access is by boat only, and the site is suited for intermediate divers due to the potential for strong currents. Depths range from 17 to 32 metres, with an average depth of 17 metres. Visibility typically spans 15 to 30 metres. Water temperatures remain warm throughout the year, ranging from 27C to 30C. Species recorded around this area include French Angelfish, Purple Sea Fans, Redband Parrotfish, Flamingo Tongue, Blue Tang, Wrasses, Whiptail Stingrays, Peacock Flounder, Pacific Trumpetfish, Stoplight Parrotfish, Queen Conch, Combers, White Grunt, and French Grunt. Divers should be aware of sharks and strong currents.

Devils Key is a shallow reef dive located off Culebra Island, Puerto Rico. The site features a maximum depth of 55 feet, making it accessible for divers of various experience levels. As a local reef site, it offers a varied underwater topography suitable for those looking for a relaxed dive. Water temperatures at this location range between 27C and 30C throughout the year. Divers should be prepared for variable conditions typical of the region. The site is primarily accessed by boat from the surrounding area.

Cayo Diablo is a reef site located 1000 metres off the coast of Culebra Island. The reef sits at depths between 13 and 16 metres, with an average depth of 15 metres. Divers can expect visibility ranging from 20 to 25 metres and mild currents. The site is suitable for intermediate divers and is accessible by boat. Night diving is a popular option here, offering a different perspective of the reef structure. Divers should remain aware of potential rip currents and the presence of jellyfish. Always consult with a local operator regarding current conditions and safety requirements before entering the water.

Roosevelt Roads, located off Culebra Island, features a combination of reef structures and seagrass beds. The site ranges from 9 to 24 metres in depth, with an average of 15 metres. Divers can expect moderate currents and visibility between 15 and 30 metres. Entry is possible from both shore and boat, though caution is required regarding sharp rocks and coral during shore entries. Due to active boat traffic in the area, divers should deploy a surface marker buoy before ascending. Water temperatures range from 27 to 30 degrees Celsius throughout the year. This site is suited for intermediate divers, with typical dive times lasting approximately 45 minutes.