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.

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.

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.

Blue Hole in Apra Harbor is a natural limestone plateau featuring a vertical shaft that begins at approximately 18 metres and opens through a window at 38 metres. This site offers a varied topography including a wall, reef, drop-off, and cavern environment. Depths range from 10 to 95 metres, requiring advanced certification and deep diving experience to navigate the shaft. Visibility typically spans 10 to 40 metres, though divers must account for potential strong currents, surge, and boat traffic. Access is strictly by boat. Due to the significant depth and overhead environment, this site presents hazards including nitrogen narcosis and decompression requirements.

The American Tanker is a concrete barge located in Apra Harbor, Guam, originally used to transport fuel during World War II. This artificial reef sits at depths ranging from 8 to 36 metres, with an average depth of 25 metres. The wreck is accessible only by boat and is suited for intermediate divers due to the overhead environment. Divers should be aware of boat traffic in the area. Visibility typically ranges between 6 and 18 metres, and water temperatures remain consistent between 28 and 30 degrees Celsius throughout the year. The site offers a unique opportunity to explore historical maritime remains in a marine environment.

Barge Reef in Apra Harbor, Guam, features a WWII Amtrak wreck resting in a sand channel at a depth of 12 metres. The site is an artificial reef structure surrounded by a natural reef. Divers can access the site by boat or from the shore, located approximately 500 metres out. Conditions vary, with visibility ranging from 5 to 25 metres and moderate currents present. Due to the potential for strong currents, this site is suited for intermediate divers. Typical dives last around 45 minutes, with water temperatures remaining warm between 28C and 30C throughout the year.

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.

Blue and White is a varied dive site in Apra Harbor, Guam, featuring a combination of reef, wall, and artificial reef structures. Located 1000 metres from shore, the site requires boat access. Divers encounter a drop-off that begins at approximately 12 metres, descending to an average depth of 33 metres, with a maximum of 39 metres. Conditions include moderate currents and visibility ranging from 12 to 30 metres. Marine life recorded here includes wrasses, pufferfish, emperor angelfish, regal angelfish, and various butterflyfish and anemonefish. Due to the depth and current, this site is suited for intermediate divers. Hazards include sharp coral, strong currents, and surf.