Blue Hole

Jacques Cousteau filmed the Great Blue Hole in 1971 and called it one of the world’s top ten dive sites. That declaration turned a geographic obscurity – a submarine sinkhole 70 kilometres from the Belizean coast – into a bucket-list destination. The influence of Cousteau’s list-making on dive tourism is arguably his most durable legacy, and the Blue Hole is the clearest example: a site that is genuinely spectacular but was largely unknown to non-specialists until it had a famous person’s endorsement attached to it.

The Blue Hole is a circular sinkhole 318 metres in diameter and over 120 metres deep, within the Lighthouse Reef Atoll approximately 70 kilometres southeast of Belize City. The water is that specific shade of deep blue that comes from extreme depth and clarity, clearly visible from the air against the turquoise shallows of the surrounding atoll. The stalactites in the deeper sections of the sinkhole – formed during periods when the cave was above sea level during ice ages, then submerged as sea levels rose – are what divers come for specifically.

The Dive

The Blue Hole is an advanced diving destination. To dive the main sinkhole below the first ledge at 30 metres requires Advanced Open Water certification at minimum; most serious dive operators require significant additional logged deep dives before taking you down to the 40-metre stalactite zone. This is not a shallow reef dive. The main attraction – the large stalactite formations at depth, visible hanging from the cave ceiling – is inaccessible to anyone without the right certification and experience.

The surrounding shallow reef is suitable for recreational divers and snorkellers, but the Blue Hole itself as a visual experience from shallow depth is less interesting than its reputation suggests. The dive is worth doing if you have the qualifications; as a snorkelling excursion, you’re primarily seeing the colour from above rather than the geological features within.

Day trips from San Pedro on Ambergris Caye (the standard base) run around BZD $250-280 per person and take 2-3 hours each way by speedboat. These trips typically include stops at Half Moon Caye (red-footed booby bird sanctuary, white sand beach) and Lighthouse Reef shallower sites, making the day more varied than the Blue Hole alone would justify.

Ambergris Caye as Base

San Pedro on Ambergris Caye is the main dive and tourism hub for the Belize Barrier Reef. The reef runs the length of the caye and is accessible in 15 minutes by boat from the island’s dive operators. Hol Chan Marine Reserve – a narrow channel cut through the reef with excellent fish density – and Shark Ray Alley are the daily reef dive and snorkel sites. These are more reliably rewarding for most visitors than the Blue Hole because the marine life concentration is higher and the access depth is manageable.

Ambergris Caye has a range of accommodation from budget guesthouses to mid-range hotels and boutique beach properties. For a dive-focused stay, book with an operator that runs their own boat: the flexibility on Blue Hole departure timing depends on weather and you want the guide’s knowledge of current conditions.

Getting There

Belize City’s Philip S.W. Goldson International Airport (BZE) receives flights from US and Central American hubs. Water taxis from Belize City’s Marine Terminal to San Pedro on Ambergris Caye run regularly (about 1.5 hours) and are the standard connection.