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.

San Luis Beach in Apra Harbor, Guam, offers a combination of natural reef and artificial reef structures accessible via a shore entry. The site is suitable for beginners, with depths ranging from 6 to 33 metres and an average depth of 18 metres. Divers should anticipate mild currents and visibility typically between 6 and 10 metres. The location is well-equipped with facilities including parking, toilets, showers, changing rooms, and rinse stations. Air fills, dive shops, and boat charters are available nearby. Night diving is permitted at this location. Hazards to be aware of include jellyfish, rip currents, sharks, sharp coral, and stonefish.

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.

Fuel Pier in Apra Harbor, Guam, is an artificial reef and wreck site accessible only by boat. Divers typically explore the structure at depths ranging from 14 to 27 metres, with an average depth of 25 metres. The site presents challenging conditions, including low visibility between 1 and 3 metres, potential entanglement hazards, and active boat traffic. Due to the overhead environment and limited visibility, this site is suited for intermediate divers. Night diving is permitted. Species recorded around this area include wrasses, triggerfish, angelfish, and moray eels, though these are not confirmed sightings at the pier itself.

Western Shoals is a sloping reef located within Apra Harbor, Guam. This site is suitable for beginners and offers a depth range of 3 to 27 metres, with an average depth of 10 metres. Divers typically spend 45 minutes exploring the reef, which features healthy coral growth. Access to the site is by boat only. Conditions are generally mild, with visibility ranging from 9 to 30 metres and water temperatures between 28C and 30C throughout the year. Due to the location, divers should remain aware of boat traffic in the area.

The Kitsugawa Maru is a freighter sunk in July 1944 that sits upright in Apra Harbor. The wreck remains approximately 80 percent intact, featuring a large bow gun and masts that begin at 18 metres. Divers can expect depths ranging from 15 to 42 metres, with an average of 27 metres. This boat-only dive is suited for advanced divers due to the depth and overhead environment. Visibility varies between 4 and 20 metres, and moderate currents are common. Marine life frequently recorded at the site includes pufferfish and wrasses, alongside less common species such as Pacific doublesaddle butterflyfish, threadfin butterflyfish, flagtail triggerfish, and blackback anemonefish.

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.

The Tokai Maru is a WWII Japanese freighter resting on its port side in Apra Harbor. Sunk on 27 August 1943, the wreck lies at depths between 15 and 40 metres, with an average depth of 25 metres. It is notable for resting against the SMS Cormoran, allowing divers to touch both a WWI and WWII wreck simultaneously. Access is by boat only, located 1500 metres from shore. Divers encounter common species including pufferfish, wrasses, cardinalfish, soldierfish, and hermit crabs, alongside less frequent sightings of butterflyfish, triggerfish, and various sea stars. Due to the depth and overhead environment, this site is strictly for advanced divers.