Guam is a premier destination for scuba diving in the Western Pacific, offering a unique blend of natural beauty and historical significance. With water temperatures that remain warm year-round and visibility that often exceeds 100 feet, it is an ideal location for both beginners and experienced divers. This guide provides a comprehensive overview of what you need to know to plan a successful diving trip to Guam.
Why Guam is a Top Diving Destination
Guam stands out in the diving world due to its accessibility and the variety of its underwater landscapes. The island is surrounded by a fringing reef that protects many of its most popular dive sites from heavy currents. This makes the area particularly welcoming for those who are new to the sport.
Beyond the natural coral formations, Guam is world-renowned for its shipwrecks. It is one of the few places in the world where divers can touch two shipwrecks from two different world wars at the same time. This historical depth, combined with thriving marine life, creates a diving experience that is difficult to find elsewhere.
Essential Diving Conditions in Guam
Understanding the local conditions is the first step in planning your dives. Guam enjoys a tropical climate, which translates to consistent underwater conditions throughout the year. Knowing what to expect helps you pack the right gear and choose the best times for your excursions.
- Water Temperature: The water stays between 82°F and 84°F (28°C to 29°C) year-round. Most divers find a 3mm shorty or even just a rash guard sufficient.
- Visibility: Visibility is typically excellent, ranging from 60 to over 100 feet. This clarity is perfect for underwater photography and navigating complex reef systems.
- Currents: While some outer reef sites have strong currents, many popular spots in Apra Harbor are calm and protected. Always check local dive reports before heading out.
Top Dive Sites to Explore
Guam offers dozens of dive sites, ranging from shallow beach entries to deep-sea walls. Depending on your certification level and interests, you can choose from historical wrecks or vibrant natural ecosystems. Here are the most highly recommended locations.
The Blue Hole
The Blue Hole is perhaps Guam’s most iconic dive site. It is a natural limestone shaft that drops vertically into the reef flat. Divers enter the hole at about 60 feet and can exit through a large window at approximately 125 feet.
The site is known for its incredible visibility and the unique perspective it offers of the deep blue ocean. Because of the depth, this site is generally recommended for advanced divers. It is common to see large pelagic fish, such as tuna and reef sharks, cruising near the exit window.
The SMS Cormoran and Tokai Maru
Located in Apra Harbor, this site is a must-see for history enthusiasts. The SMS Cormoran was a German vessel from World War I, and the Tokai Maru was a Japanese freighter from World War II. The two ships lie touching each other at the bottom of the harbor.
Divers can place a hand on both ships simultaneously, spanning two different eras of global history. The wrecks are located at depths between 40 and 120 feet. Because they are in the harbor, visibility may be slightly lower than at ocean-side sites, but the historical value is unmatched.
Gab Gab II
Gab Gab II is an excellent site for those looking for easy access and abundant marine life. It is located near the shore and is often used for introductory dives and certification courses. The reef is healthy and supports a large population of sea turtles.
In addition to turtles, you are likely to see giant anemones, clownfish, and schools of parrotfish. The depth is manageable, usually staying above 60 feet, making it a relaxing dive for all experience levels. It is also a popular spot for night diving.
The Crevice
Located near the Blue Hole, The Crevice is a large fold in the reef wall. It is characterized by massive boulders and deep cuts where various marine species hide. This site is known for its dramatic topography and the presence of larger sea life.
Divers often encounter barracuda, eagle rays, and occasionally hammerhead sharks in this area. The depth varies, but the most interesting features are found between 60 and 100 feet. The currents here can be stronger, so it is often treated as a drift dive.
Marine Life You Will Encounter
Guam’s waters are home to over 1,000 species of fish and nearly 400 species of coral. The biodiversity is a major draw for nature lovers. When diving in Guam, you should keep an eye out for several key species that are common to the region.
- Green Sea Turtles: These are frequently seen resting on the reefs or feeding on sea grass. They are generally calm around divers if approached slowly.
- Spinner Dolphins: While more common to see from a boat, they are occasionally spotted during safety stops near the outer reefs.
- Reef Sharks: Blacktip and whitetip reef sharks are common sights. They are generally shy and pose no threat to divers.
- Macro Life: For those who enjoy small details, Guam offers various nudibranchs, leaf fish, and pipefish hidden within the coral structures.
Planning Your Diving Logistics
Organizing a diving trip to Guam is straightforward, as the island has a well-developed tourism infrastructure. There are several professional dive shops that offer equipment rentals, guided tours, and certification courses. Most shops are located in the Tumon Bay area or near Apra Harbor.
Getting Certified
If you are not yet a certified diver, Guam is a great place to learn. Many shops offer PADI or NAUI courses that can be completed in three to four days. You can often complete the classroom portion online before you arrive, allowing you to spend more time in the water.
Equipment Rentals
You do not need to bring your own gear to enjoy Guam’s diving. Local shops provide high-quality regulators, BCDs, wetsuits, and computers. However, bringing your own mask and fins can ensure a more comfortable fit and a better overall experience.
Boat vs. Shore Diving
Guam offers a mix of both boat and shore diving. Shore dives are cost-effective and allow for a flexible schedule. Boat dives are necessary for reaching the more remote sites like the Blue Hole or the shipwrecks in the middle of the harbor. Most divers choose a combination of both to see the full range of what the island offers.
Safety and Regulations
Safety should always be the priority when diving. Guam has modern medical facilities, including a decompression chamber located at the Guam Memorial Hospital. However, following standard safety protocols will ensure you never need to use these services.
Always dive within your certification limits and monitor your air consumption closely. It is also important to respect the local environment. Guam has strict laws against touching or removing coral and harassing marine life. Staying buoyant and keeping your fins away from the reef helps preserve these sites for future generations.
Finally, remember the rule about flying after diving. Because of the nitrogen levels in your body, you should wait at least 18 to 24 hours after your last dive before boarding a plane. This is an important consideration when scheduling your return flight from the island.
Conclusion
Diving in Guam offers a world-class experience characterized by warm waters, historic shipwrecks, and diverse marine life. Whether you are exploring the depths of the Blue Hole or admiring the turtles at Gab Gab II, the island provides a safe and exciting environment for underwater exploration. By planning ahead and choosing the right sites for your skill level, you can ensure a memorable adventure.
For more tips on outdoor activities and travel preparation, explore our other guides on SearchAndHelp.com to make the most of your next trip.