Amtrak is a WWII-era vehicle wreck located in Apra Harbor, Guam. The wreck rests in a sand channel at a depth of approximately 40 feet, surrounded by a reef. This site is accessible via both boat and shore entry, making it a versatile location for divers. Water temperatures at the site are warm, ranging between 28C and 30C throughout the year. Due to its depth and location, it is a popular destination for those interested in historical wrecks and reef topography.

Hap's Reef is a prominent coral mound located 400 metres from shore in Apra Harbor. The site features a reef structure that rises to a depth of 6 metres, surrounded by mixed reef and sand flats that extend to depths of 20 metres. Divers typically experience visibility of 20 metres and mild currents. This site is accessible by boat and is suitable for beginner divers, with an average dive duration of 45 minutes. Water temperatures remain consistent throughout the year, ranging between 28C and 30C. Divers should be aware of sharp coral present at the site.

Umatac is a shore-entry dive site located in Apra Harbor, Guam, featuring a combination of reef and wreck topography. The site is suited for intermediate divers due to the presence of strong currents. Divers can expect depths averaging 10 metres, with visibility ranging from 10 to 30 metres. Water temperatures remain warm throughout the year, typically between 28C and 30C. While specific sightings at this exact location are not confirmed, species recorded around this area include Napoleon Wrasse, Emperor Angelfish, Spotfin Lionfish, Giant Moray, Indian Lionfish, Titan Triggerfish, Regal Angelfish, various wrasses, pufferfish, Blackspotted Pufferfish, Pacific Doublesaddle Butterflyfish, Pink Skunk Anemonefish, Pacific Bullethead Parrotfish, and Sling-jaw Wrasse.

Turtle Rock in Apra Harbor, Guam, features a distinctive rock formation shaped like a turtle. The site offers a reef and wall topography with a steep drop-off reaching depths of 26 metres. Divers can expect an average depth of 15 metres. Conditions are generally mild, though visibility fluctuates between 2 and 21 metres. Access is possible via both shore and boat, making it suitable for beginners. Due to the location, divers should remain aware of boat traffic in the area. Water temperatures remain consistent throughout the year, ranging from 28 to 30 degrees Celsius.

Tarzan Cave in Apra Harbor, Guam, offers a diverse underwater environment featuring a combination of reef, cave, and wreck topography. Divers can explore numerous underwater boulders and various artifacts dating back to World War II. The site is suitable for intermediate divers, with depths ranging from 9 to 18 metres and an average depth of 14 metres. Visibility is high, typically between 18 and 30 metres, with mild currents. Entry to the site can be made by either boat or shore. Due to the presence of boat traffic and depth, divers should maintain appropriate safety protocols throughout their dive.

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.

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 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.