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Great Blue Hole

Max depth

124m

Type

Wall

Cert level

Advanced Open Water

Entry

boat

Current

low

Visibility

15-30 mm

Hazards

Deep profile, nitrogen narcosis risk, overhead-like stalactite features, and remote boat access.

Emergency information

Remote offshore site; operator emergency oxygen, communications, and evacuation plan are essential.

About this site

Iconic marine sinkhole at Lighthouse Reef Atoll in the Belize Barrier Reef Reserve System.

Typical depth

40m

Best season

Dry season and calm-weather windows.

Access & parking

Boat/liveaboard access from Belize operators; typical recreational dives stay far shallower than the full sinkhole depth.

Local regulations

Follow Belize marine protected-area and operator rules.

Site information is contributed by the community. Always verify conditions locally before diving. Diving can be hazardous — dive within your training and experience.