Barracuda Rock in Apra Harbor, Guam, is a diverse site featuring a reef, cavern, and tunnel system. The topography includes a mini cave and a tunnel beneath a large coral head, providing swim-throughs suitable for beginners. Depths range from the surface to 32 metres, with an average depth of 14 metres. Access is by boat only. Divers and snorkellers should be aware of potential hazards, including overhead environments, sharp coral, and mild currents. Visibility varies significantly, ranging from 9 to 45 metres. Water temperatures remain warm throughout the year, typically between 28 and 30 degrees Celsius.

Finger Reef is a sloping reef located 500 metres from shore within Apra Harbor. The site features a depth range of 2 to 27 metres, with an average depth of 15 metres. Access is by boat only, and divers should be aware of moderate currents and boat traffic in the area. The topography consists of sloping coral formations. Due to the presence of sharp coral and jellyfish, appropriate exposure protection is recommended. This site is suitable for beginners and offers a typical dive duration of 45 minutes. Visibility at the site ranges from 9 to 27 metres, with water temperatures remaining between 28 and 30 degrees Celsius throughout the year.

Vecky's Reef is a marine site located within Apra Harbor, Guam. The site features a consistent depth of approximately 9 metres, though depths in the surrounding area can reach 20 metres. Access to this location is by boat only. Divers and snorkellers should be aware of moderate currents and potential boat traffic in the vicinity. Visibility at the site typically ranges between 12 and 21 metres. Water temperatures are warm throughout the year, ranging from 28C to 30C. This site is suitable for beginners, provided they are comfortable with the prevailing current conditions.

Spanish Steps in Apra Harbor, Guam, is a shore-entry site featuring a combination of natural reef and artificial reef structures. Suitable for beginners, the site offers an average depth of 7 metres, with a maximum depth of approximately 9 metres. Divers can expect mild currents and visibility ranging from 15 to 30 metres. Water temperatures remain warm throughout the year, typically between 28C and 30C. The site is accessible for night diving, with parking facilities available nearby. Divers should remain cautious of boat traffic in the area, as well as the presence of sea urchins and sharp coral on the reef.

Gab Gab in Tumon Bay, Guam, offers a diverse underwater environment featuring a reef, a wall, and an artificial reef. Divers can explore depths ranging from 5 to 30 metres, with an average depth of 18 metres. Access is via a shore entry, making it suitable for beginners. Conditions generally feature mild currents and visibility between 9 and 30 metres. The site is also available for night diving, with typical dives lasting 45 minutes. Facilities including parking, toilets, showers, and equipment rental are available. Species recorded around this area include Napoleon Wrasse, Emperor Angelfish, various wrasses, and Pacific Bullethead Parrotfish. Be aware of hazards such as boat traffic, entanglement, overhead environments, and sharp coral.

Gab Gab II is a large reef mound located within Apra Harbor, Guam. Situated approximately 91 metres from the shore, the site features depths ranging from 13 to 30 metres with an average of 20 metres. Divers and snorkellers can access the reef by boat or from the shore. Conditions are generally mild, with visibility between 10 and 30 metres. The site is suitable for beginners and supports night diving. Facilities available at the location include parking, toilets, showers, changing rooms, and a rinse station. Be aware of boat traffic in the area. A typical dive lasts 45 minutes.

Sharks Pit is a drift dive located in Apra Harbor, Guam, featuring a steep slope and a large haystack rock that rises from 27 metres to 5 metres. The site is notable for its collection of WWII artifacts scattered along the slope. Divers can expect depths ranging from 4 to 35 metres, with an average depth of 20 metres. Visibility is typically between 20 and 30 metres. Due to moderate currents and boat traffic, this site requires boat access. While suitable for beginners, divers should remain aware of the depth and current conditions.

SeaBee Junkyard in Apra Harbor is an artificial reef site featuring a collection of heavy equipment, including bulldozers, abandoned by the Seabees following the construction of the breakwater. The site also contains a small transfer ship resting on the seabed at a depth of 40 metres. Divers can explore this underwater industrial site at depths ranging from 11 to 40 metres, with an average depth of 14 metres. Access to the site is by boat only, located 183 metres from the shore. Conditions include moderate currents and visibility ranging between 6 and 18 metres. Water temperatures remain consistent throughout the year, typically between 28 and 30 degrees Celsius.