Old Issac’s
Protected Area
Radio Mast - Sand Bluff (Grand Cayman)
Why dive here
With 327+ marine species recorded in the area - including barracuda, bull sharks, oceanic whitetip sharks, orcas and sea turtles - Old Issac’s offers some of Grand Cayman's richest reef diving. Water ranges 27-31°C, warmest August, September, October.
Old Issac’s on Grand Cayman is one of those sites we always recommend, especially for a relaxed afternoon dive. The main draw is that ledge, starting around 8 metres and dropping down to a rubble bottom at 18 metres. It’s a gentle drift along the wall, perfect for just letting the current carry you. What we really love here, though, is the coral nursery. Those PVC "trees" are full of growing staghorn and elkhorn coral, and they really pull in the fish. You'll often see schools of blue runners circling, and it’s a great spot for blue parrotfish munching away. Keep an eye out for the redlip blennies too; they’re often tucked into crevices along the top of the ledge. We've had some fantastic encounters with Nassau grouper cruising through the nursery too. The visibility is usually excellent, around 24 metres, making it an easy site to navigate and spot the smaller stuff. It's a great pick for newer divers or anyone looking for a chill dive with plenty of photographic opportunities.
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Ocean Frontiers
Tortuga Divers
Silver Thatch Watersports
Divers Down
OCTOPUS
Divers Supply
Reviews for Old Issac’s
Conditions
Ocean conditions, forecast and tides for Old Issac’s
Old Issac’s Ocean Conditions
Monthly averages for Old Issac’s, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (19.38, -81.32) (5km away)
October Averages
Sea Temperature
30°C
87°F · Range: 29.1–31.8°C
Current Speed
4.47 cm/s
Direction: NW (296.6°)
Chlorophyll-a
0.045 mg/m³
Very clear (oligotrophic)
Salinity
36.14 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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