Great Blue Hole, Belize: Diving the Most Famous Submarine Sinkhole on Earth

The Great Blue Hole is a giant submarine sinkhole located about 70 km off the coast of Belize near the centre of Lighthouse Reef Atoll. Roughly 300 metres across and 125 metres deep, it was formed during the last ice age when sea levels were much lower and what is now the seafloor was a limestone cave system above the waterline. As glaciers melted and seas rose, the cave flooded and its roof collapsed, creating the near-perfect circle visible from the air. Jacques Cousteau explored the site in 1971 and ranked it one of the top ten scuba diving destinations in the world; it has been a legend ever since.

What Makes It Special

The walls of the Blue Hole plunge vertically from the surface to 125 m, adorned with enormous stalactites and stalagmites — the remnants of the cave's geological history — that begin to appear at around 25–30 metres depth. The site is part of the Belize Barrier Reef Reserve System, a UNESCO World Heritage Site and the largest barrier reef in the Northern Hemisphere.

Marine life in and around the Blue Hole includes Caribbean reef sharks, bull sharks (commonly seen hovering just below the thermocline at depth), midnight parrotfish, giant groupers, and nurse sharks. The shallow surrounding reef is excellent for snorkelling and freediving, with vibrant coral gardens and abundant reef fish just metres from the surface.

For freedivers, the descent into the hole is a unique visual and psychological experience: the gradual transition from bright blue to deep midnight blue as depth increases, and the forest of stalactites emerging from the darkness at 25 m, is unlike any other dive destination on the planet.

Getting There from Korea

There is no direct flight from Korea to Belize. The most practical routing is:

Via Dallas or Houston (American Airlines / United): Incheon → Dallas Fort Worth or Houston Intercontinental → Belize City (Philip S.W. Goldson International Airport). Total travel time: approximately 20–24 hours including layover.
Via Miami (American Airlines): Incheon → Miami International → Belize City. Similar total travel time.

From Belize City, visitors proceed to Ambergris Caye (by domestic flight on Tropic Air or Maya Island Air, ~20 min; or water taxi, ~1.5 hrs). From San Pedro on Ambergris Caye, or from the mainland, day trips to the Great Blue Hole are operated by licensed dive operators. The boat journey takes approximately 2–3 hours each way.

Alternatively, overnight or multi-day liveaboard trips originating in Belize City offer a more immersive experience and cover multiple Lighthouse Reef sites.

Accommodation

Most divers visiting the Blue Hole base themselves on Ambergris Caye (San Pedro), Belize's largest island and main tourist hub, or the more laid-back Caye Caulker.

San Pedro (Ambergris Caye): Wide range from budget hotels (USD 50–80/night) to full-service dive resorts (USD 150–300+/night). Ramon's Village Resort and Sunbreeze Dive Resort offer integrated dive services.
Caye Caulker: More backpacker-friendly, with guesthouses from USD 30–60/night. Quieter, no cars on the main island.
Turneffe Atoll: For a closer base to the dive sites, Turneffe Atoll Resort is a premium option.

Food and Dining

Belize's cuisine reflects its multicultural heritage — Mayan, Creole, Garifuna, and Mestizo influences blend in dishes like stewed chicken with rice and beans (the national staple), conch fritters, hudut (Garifuna fish and coconut milk stew), and fresh grilled seafood. San Pedro has a lively food scene with restaurants serving everything from local Belizean cooking to Mexican, Italian, and seafood fusion. Fresh juices, coconut water, and local Belikin beer are staples.

Best Time to Visit

Belize's dry season runs from November to May, with the peak months for calm seas and best underwater visibility falling between December and April. Hurricane season runs from June to November; travel during this period is possible but less predictable. Water temperature stays around 26–29°C year-round.

Practical Tips

Day trips to the Blue Hole typically include three dives: the Blue Hole itself, Half Moon Caye Wall, and Long Caye Wall. Budget USD 250–350 for a day trip including equipment rental.
Book early: boats to the Blue Hole are limited and fill up quickly, especially December–April.
Belize uses USD alongside its own currency (BZD = 2:1 to USD), making budgeting straightforward.
No decompression diving is required for the stalactite zone — 30 m is well within recreational limits.