Old Issac’s - Grand Cayman

Roca Peligrosa, or Danger Rock, sounds a bit intimidating, doesn't it? But we've always found it to be more exciting than dangerous, an exposed pinnacle poking out of the Caribbean just south of the Catalina Islands. We love this site for its raw energy; the surge here is almost constant, rocking you gently back and forth as you trace the contours of the rock face. Our favourite way to dive it is to descend quickly, hugging the rock as it slopes down to a modest 20 metres. You'll often find big schools of red snapper and brassy grunt hanging in the current, almost shimmering as the light filters through. Keep an eye out for blennies – the Panamanian worm blenny and Hancock's blenny are particularly good finds tucked into crevices. While the visibility can be a bit variable, averaging around 11 metres, the sheer volume of fish makes up for it. This isn't a beginner's site; the surge and occasional stronger currents mean you need to be comfortable in the water, but for divers who enjoy a bit of dynamism, it's a real treat. We once had an olive ridley sea turtle cruise by, completely unfazed by the movement, which was a real highlight.

Location
Grand Cayman, Cayman Islands, Caribbean
Coordinates
19.295200, -81.089500
Type
reef

Marine Protected Area: Radio Mast - Sand Bluff (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

Nearest Dive Centres to Old Issac’s

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

Recommended Packing List for Old Issac’s

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