Great Blue Hole

Verified2026-09-11 checkedCavernWall

A collapsed limestone sinkhole 300 m across, dived for stalactites at 40 m rather than for marine life.

Depth: 10–40 m33–131 ft
Difficulty: Advanced
Entry: Boat · Liveaboard
Typical current: None
Coordinates: 17°18.948′N 87°32.082′W
Activities: Scuba · Technical

The Blue Hole is a flooded cave system that collapsed when sea levels rose after the last ice age. The dive is a straight descent to about 40 m along a wall, a few minutes among enormous stalactites hanging from an overhang, and a slow ascent — no more than eight minutes of bottom time and almost no fish. It is honestly not much of a dive on marine life; it is a geology dive, and its reputation outruns the experience. Depth and nitrogen discipline are the whole exercise. Most trips pair it with two far better reef dives at Half Moon Caye.

Day boat from Ambergris Caye or Caye Caulker, around two hours, or by liveaboard.

Best season

ExcellentApr–Jun
GoodDec–Mar
GoodJul–Aug
FairNov

Before you get in

A cavern — inside the daylight zone, but still with a ceiling, and with stretches where you cannot simply go up.
Past 30 m, where no-stop time and gas both go quickly and nitrogen narcosis starts to show.
A wall. There is no bottom in sight to judge against, so depth is kept by the gauge alone — and it is easy to end up deeper than intended.

Taken from this site’s recorded depth, type and current, and nothing else. An empty list is not a safe site — the sea on the day, the local geography and the boat traffic are not in it. The briefing on the spot comes first.

Conditions

Water temperature: 30.2°C86°F
Wave height: 0.8 m3 ft
Air temperature: 28.3°C83°F
Wind speed: 12.6 km/h7.8 mph

Updated 2026-10-07 16:15 UTC · Source: Open-Meteo

Weather data by Open-Meteo.com (CC BY 4.0)

Conditions are reported for information only. Assess the site yourself and follow your guide and your training.

No live conditions for this site yet.

We only show numbers we can attribute to a source.

Sea state and tide

On a date

Tide · 10/7

Low11:500.18 m

Forecast heights against mean sea level. Real tides in a bay, a harbour or over a flat can differ — check an official tide table before you get in.

Pick a day to see its tide

Only wave height and wind are scored, because those are what close a boat ramp or a shore entry. Water temperature is reported and never scored: 12°C is an ordinary dive in a drysuit and punishing in a 3 mm, and a number that cannot see your suit has no business marking it down. Stars do not decide whether you get in — you and your guide do, on the day.

Weather data by Open-Meteo.com (CC BY 4.0)

Marine life you may see

Queen angelfishHolacanthus ciliarisRare
Caribbean reef sharkCarcharhinus pereziCommon
Nurse sharkGinglymostoma cirratumSeasonal
Hawksbill turtleEretmochelys imbricataRare
Green morayGymnothorax funebrisCommon
Caribbean spiny lobsterPanulirus argusCommon
Brain coralDiploria spp.Common
Giant barrel spongeXestospongia mutaCommon
Boulder star coralOrbicella annularisCommon

From divers

What people who were in the water reported. Not a forecast, and not a judgement about whether the site is safe to dive.

No recent reports from divers. If you dived here in the last two weeks, you can say how it was.

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