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Diving Guide
WWII wrecks, Blue Hole, and world-class Pacific reef diving
Verified 2026 · Island Seeker Editorial
Guam sits at the edge of the Mariana Trench — the world's deepest ocean — with a fringing coral reef system that has been recovering beautifully since WWII. The combination of accessible WWII wrecks (Japanese freighters, aircraft, supply ships), the famous Blue Hole vertical cave dive, and pristine coral reef walls makes Guam a genuine bucket-list dive destination. Dive operators cater extensively to Japanese divers, making Guam particularly welcoming for that market.
WWII Wreck Diving
Guam has some of the Pacific's most accessible WWII wrecks — the Tokai Maru, Cormoran II, and multiple Japanese aircraft — mostly at 15–40m, reachable by day-boat.
Blue Hole
Guam's most famous dive site — a vertical underwater chimney dropping from 18m to over 100m, with coral formations and pelagic fish. Suitable for Advanced Open Water and above.
Reef Dives
Guam's fringing reef features coral walls, sea turtles, eagle rays, reef sharks, and dense fish life — accessible to Open Water divers on most day-boat tours.
Best Conditions
Year-round diving — water temperature stays 28–30°C. Visibility typically 20–40m. Typhoon season (Aug–Oct) can limit some dive sites but doesn't close the island.
🤿 Dive Operators & Water Sports
Verified dive operators, snorkelling tours, and water activity providers
Guam's dive industry is professional and well-established, with operators catering specifically to Japanese and Korean divers — many staff are Japanese-speaking. Day-boat dive trips depart from Tumon Bay and Apra Harbor, with WWII wreck sites accessible within 15–30 minutes by boat. Most operators offer equipment rental for certified divers and full PADI courses for beginners. Night dives on the reef flat are popular and well-supported.
questions & answers
What certification do I need to dive in Guam?
Most of Guam's popular dive sites are suitable for Open Water certified divers. Blue Hole requires Advanced Open Water or equivalent due to depth (18m entry). WWII wrecks vary — some are suitable for Open Water, others require Advanced or Rescue qualifications. Dive operators provide site recommendations based on your certification level. If you're not certified, all major operators offer PADI Open Water courses that can be completed within 3–4 days.
What are the best WWII dive sites in Guam?
Guam's top WWII dive sites include: the Tokai Maru (Japanese freighter, 40m), the Cormoran II (German merchant raider, 40m), Japanese Zero aircraft in shallow water near Apra Harbor, and the American Tanker. Most sites are in Apra Harbor — a protected inner harbor that offers excellent visibility and calm conditions. Many wrecks now function as artificial reefs with rich marine life.
Is Guam good for night diving?
Yes — Guam has excellent night diving, particularly on the reef flats and at specific wreck sites. Night dives reveal octopus, sleeping reef fish, hunting morays, bioluminescent organisms, and different reef behaviour. Several dive operators offer guided night dives from Tumon Bay and Apra Harbor. Night diving in Guam is generally safe and well-supported by experienced local operators.
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