Deans Blue Hole
Why dive here
With 362+ marine species recorded in the area - including barracuda, blacktip reef sharks, dolphins, dwarf minke whales and humpback whales - Deans Blue Hole offers some of Long Island's richest cenote diving. Water ranges 25-30°C, warmest July, August, September.
Dropping into Dean's Blue Hole is a unique experience, a sheer wall descent into an enormous limestone cavern. You'll find yourself surrounded by schooling tarpon and snapper as you sink, with the occasional reef shark patrolling the edges. It’s a compelling spot for advanced divers looking for something a bit different, a truly vertical dive where the bottom is out of sight. The real draw here is the incredible depth and geological formation, not necessarily a vibrant coral reef.
Safety Notes
Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.
Reviews for Deans Blue Hole
Conditions
Ocean conditions, forecast and tides for Deans Blue Hole
Deans Blue Hole Ocean Conditions
Monthly averages for Deans Blue Hole, sourced from Copernicus Marine satellite data
August Averages
Sea Temperature
30.01°C
86°F
Current Speed
13.34 cm/s
Direction: N (347°)
Chlorophyll-a
0.044 mg/m³
Very clear (oligotrophic)
Salinity
36.67 PSU
Data sources: Copernicus Marine Service (EU)
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