doe.ky · Official Map
Government moorings map listing Big Tunnels and its mooring depth.
Dive Spot Guide•
Big Tunnels
Big Tunnels is a boat-access tunnel dive on Grand Cayman's west wall.
Make this a real next stop
Save it, log a dive, or explore nearby on the map.
Save it to come back later
Local operator required
Boat access is the practical model, with the site marked by a mooring line.
Plan for boat access, overhead swim-throughs, and a wall exit on one of Grand Cayman's best-known sites.
About Big Tunnels
Big Tunnels is a boat-access west-wall dive in Grand Cayman with a limestone pinnacle, tunnel swim-throughs, and a coral archway that opens toward the wall. It is known for dramatic passages, steady coral growth, and a route shape that feels more like underwater canyoning than a simple reef drift. The west side is usually calm, but the site still suits divers comfortable with overhead space, depth, and the occasional current pulse.
•
Research Estimate At Big Tunnels
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 30m
AccessSimple entry
CoralPristine, vibrant coral
Aquatic LifeExceptional variety
FacilitiesGood facilities
Crowd / PopularityQuite busy
CurrentLight current
SurgeFlat calm
Where Is Big Tunnels?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
Big Tunnels Planning Details
Depth range, seasonality, and planning context.
Reported Depth
17m - 32m
Depth Note
The mooring is shallow, but the tunnel and wall section push the dive into deeper water.
Best Season
year-round
Typical Conditions
The west side is leeward and seas are usually calm, with the best visibility in ordinary dry-season conditions.
Safety & Access At Big Tunnels
Hazards, restrictions, and access requirements.
Key Hazards
Overhead environmentStrong current
Safety Notes
The tunnel and wall route requires buoyancy control, gas awareness, and comfort in overhead spaces; current can show up in the passages and at the safety stop.
Local Intel For Big Tunnels
Community notes to help plan your visit.
Scuba Diving
Expect a tunnel swim-through, coral archways, and a wall exit with strong photo potential.
Wildlife at Big Tunnels
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Big Tunnels
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Big Tunnels
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility30m
Activity
No dive activity logged yet.
