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

Frequently Asked Questions

What is the typical depth range for diving at Old Isaac's dive site?
Divers at Old Isaac's can expect a varied depth profile. The site features a ledge that drops from approximately 25 to 50 feet (7.6 to 15.2 meters), with a line of coral heads found at 60 feet (18 meters). The maximum depth for this site is 18 meters, making it suitable for divers comfortable with these depths.
What kind of marine life and coral can divers expect to see at Old Isaac's?
Old Isaac's is rich in marine life and diverse corals. Divers can spot fascinating creatures like yellow-headed jawfish and pike blennies, alongside a variety of hard and soft corals. The dedicated coral nursery, with its staghorn and elkhorn corals, also attracts large fish that congregate around the out-planting structures, offering excellent viewing opportunities for wildlife enthusiasts.
Is Old Isaac's considered a difficult dive site, and is it suitable for beginner divers?
Old Isaac's is classified as an intermediate difficulty dive site. While it offers a rewarding experience, its depth profile and features suggest it is best suited for divers with some experience rather than absolute beginners. Divers should be comfortable with depths up to 18 meters.
What is the best time of year to dive Old Isaac's for optimal conditions and visibility?
Specific information regarding the best time of year for optimal conditions at Old Isaac's is not provided in the available data. However, divers can generally expect excellent conditions with an average visibility of 24 meters (79 feet). For general guidance on seasonal diving, you might consult our When to Dive section.
What scuba diving certifications are required to dive at Old Isaac's?
The provided data does not specify the exact scuba diving certifications required to dive at Old Isaac's. Given its intermediate difficulty and maximum depth of 18 meters, an Advanced Open Water Diver certification or equivalent is often recommended for such sites, but it's best to confirm with a local dive operator.
What are the typical water conditions, including currents and visibility, at Old Isaac's dive site?
Divers at Old Isaac's can anticipate excellent water clarity, with an average visibility of 24 meters (79 feet). Information regarding typical current conditions at this specific site is not provided in the available data. It's always advisable to check local conditions on the day of your dive.