

Big Tunnels is a shallow reef site located off West Bay and Seven Mile Beach, Grand Cayman. The site features a reef structure at depths between 2 and 5 metres, offering visibility ranging from 10 to 30 metres. Access is exclusively by boat. Divers should be prepared for a moderate current, which requires careful planning and consultation with the boat operator before entry. Water temperatures remain between 27 and 30 degrees Celsius throughout the year. Due to the shallow nature of the site and potential boat traffic, divers must remain alert during ascents and surface intervals. Ensure all equipment is secured to avoid entanglement within the reef structure.
19.36827, -81.41652
The moderate current can catch beginners off guard in such shallow water, so ask your boat operator about the current direction before you enter and plan to dive into it first. Facilities are not confirmed on site, so sort any equipment and refreshments before heading out.
Boat access is required. Descend along the mooring line while the boat captain maintains position against the current.
Recorded at this site
Depth
Up to 5m
Visibility
10-30m
Entry
Boat
Boat required
Water Temp
27-30°C
Current
Moderate
Best Time
Mar, Apr, May
The site is accessible for those early in their diving journey, though the moderate current requires caution and proper planning.
The reef structure at this site is located at depths between 2 and 5 metres.
Big Tunnels is accessed by boat.
Visibility ranges from 10 to 30 metres, with water temperatures between 27 and 30 degrees Celsius. A moderate current is typically present.
Divers should remain alert for boat traffic during ascents and at the surface, and monitor equipment to avoid entanglement in the reef.
Diving at Big Tunnels in Big Tunnels requires the following certifications: Advanced. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Big Tunnels in Big Tunnels. Water temperatures range from 27°C to 30°C.
The best months to visit Big Tunnels in Big Tunnels are March, April, and May. Conditions outside these months can still be good but are less predictable.