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.

SMS Cormoran is a German merchant raider scuttled in 1917, resting in Apra Harbor at depths between 12 and 40 metres. The wreck lies alongside the Tokai Maru, with both vessels accessible to divers at a depth of approximately 29 metres. This site is reserved for advanced divers due to the overhead environment, potential for nitrogen narcosis, and deep water. Visibility ranges from 6 to 37 metres, and moderate currents are common. Access is strictly by boat, and divers must remain vigilant regarding boat traffic in the harbour. Water temperatures remain consistent throughout the year, typically between 28 and 30 degrees Celsius.

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.

OutHouse Beach in Apra Harbor is a versatile shore entry site featuring both natural reef and artificial reef structures. Suitable for beginners, the site offers depths ranging from 3 to 18 metres with an average of 10 metres. Divers and snorkellers should be aware of moderate currents, boat traffic, and potential hazards including sharp coral and stonefish. Visibility typically fluctuates between 7 and 12 metres. The site is accessible for night diving, with typical dives lasting around 45 minutes. Facilities at the location include toilets. Water temperatures remain warm throughout the year, ranging from 28 to 30 degrees Celsius.

Apra Harbor Reef offers a varied underwater landscape for intermediate divers, with depths ranging from 2 to 30 metres and an average of 15 metres. This shore-entry site features a reef structure that slopes from the shallows into deeper water. Divers should be prepared for moderate currents, which can strengthen unexpectedly; planning the dive around slack tide is recommended. Visibility typically fluctuates between 5 and 15 metres. Water temperatures remain consistent throughout the year, ranging from 28 to 30 degrees Celsius. Due to the potential for strong currents, divers must monitor their position relative to the reef throughout the 45-minute dive duration.

Harley Reef in Apra Harbor, Guam, is a unique dive site featuring both reef topography and a historical wreck. The site is notable for a 1944/45 WLA Flathead Harley-Davidson motorcycle resting at a depth of approximately 3 metres. Beyond the wreck, the site consists of a sloping wall covered in coral. Divers can expect depths ranging from 3 to 37 metres, with an average depth of 15 metres. Conditions are generally mild, though visibility fluctuates between 2 and 27 metres. Access to this site requires a boat. Due to the presence of sharp coral, divers should exercise caution when navigating the area.

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.

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.