Three Sisters Cayman - Grand Cayman
Diving the Strytan hydrothermal chimney is a truly singular experience, unlike anything else we've encountered. This colossal 55-meter cone, erupting from the seafloor, spews warm fresh water, creating a surreal environment that feels more like an alien planet than our own. We found the thermoclines fascinating, a visible shimmer where the warm water meets the cold Arctic current. Life here is sparse but utterly unique; you'll spot peculiar organisms thriving in the geothermal outflow, and the sheer scale of the chimney itself is humbling. It’s a dive best suited for experienced cold-water divers comfortable with deeper profiles and the unique conditions a hydrothermal vent presents.
- Location
- Grand Cayman, Cayman Islands, Caribbean
- Coordinates
- 19.288500, -81.117700
- Type
- pinnacle
Marine Protected Area: Cayman Dive Lodge (Grand Cayman)
Best Time to Dive in Grand Cayman
The warmest water temperatures in Grand Cayman occur in September, averaging 30.4°C. The coolest conditions are in February at 26.9°C.
Monthly Water Temperatures
- January: 27.3°C
- February: 26.9°C
- March: 27.0°C
- April: 27.7°C
- May: 28.7°C
- June: 29.2°C
- July: 29.8°C
- August: 30.3°C
- September: 30.4°C
- October: 30.0°C
- November: 29.0°C
- December: 28.0°C
Nearby Dive Sites in Grand Cayman
- Anchor Point (cenote)
- Anchor Point (wall)
- Angelfish Reef - Grand Cayman (reef)
- Angelfish Reef - Grand Cayman (reef)
- Aquarium - Grand Cayman (reef)
- Aquarium - Grand Cayman (wall)
- Armchair Reef (reef)
- Armchair Reef (reef)
- Babylon, Cayman (reef)
- Babylon, Cayman (reef)
- Balboa (Wreck) (wreck)
- Balboa (Wreck) (reef)
- Bear’s Paw (reef)
- Bear’s Paw (wall)
- Big Dipper (reef)
Nearest Dive Centres to Three Sisters Cayman
- Atlantis Dive Center
- Divers Down - PADI
- Divers Supply
- Divetech - PADI
- Diving Center - SSI, PADI, CMAS, NAUI, FEDAS, ACUC
- Don Foster's Dive Cayman, Ltd. - ["PADI"]
Marine Life in Grand Cayman
Home to 332 recorded species including 276 reef fish, 30 hard corals, 5 other, 5 seagrass & algae, 4 whales & dolphins, 4 sharks & rays.
Notable Species
- Elkhorn coral (Acropora palmata) - Hard Corals
- Massive Starlet Coral (Siderastrea siderea) - Hard Corals
- Mustard hill coral (Porites astreoides) - Hard Corals
- Gutong (Scarus iseri) - Reef Fish
- Dark Green Parrotfish (Sparisoma viride) - Reef Fish
- Blue Doctor (Acanthurus coeruleus) - Reef Fish
- Gutong (Sparisoma aurofrenatum) - Reef Fish
- French grunt (Haemulon flavolineatum) - Reef Fish
- Great star coral (Montastraea cavernosa) - Hard Corals
- Barber (Acanthurus bahianus) - Reef Fish
- Finger Coral (Porites porites) - Hard Corals
- Butterfly (Chaetodon capistratus) - Reef Fish
- Schoolmaster (Lutjanus apodus) - Reef Fish
- Grunt (Haemulon plumierii) - Reef Fish
- Lettuce Coral (Agaricia agaricites) - Hard Corals
- Bluestriped Grunt (Haemulon sciurus) - Reef Fish
- Sheephead (Microspathodon chrysurus) - Reef Fish
- Sammy Johnson (Scarus taeniopterus) - Reef Fish
- Cola (Ocyurus chrysurus) - Reef Fish
- Graysby (Cephalopholis cruentata) - Reef Fish
Recommended Packing List for Three Sisters Cayman
Based on average water temperature of 28.7°C, currents 9 cm/s.
- Shorty or Rashguard - warm 29°C water needs minimal exposure protection
- Mask - essential for every dive
- Fins
- BCD - buoyancy compensator
- Regulator - your most safety-critical piece of gear
- Dive Computer - tracks depth, time, and NDL
- Surface Marker Buoy (SMB) - essential for boat pickups
- Dive Torch - useful for crevices and colour at depth
- Underwater Camera - capture your diving memories