

Best for intermediate divers, 8-30m, boat entry, mild current.
Mercurius Rock is a seamount in Saint John that rises to within 8 metres of the surface, offering a complex topography of reef, pinnacles, caves, and caverns. The site extends to a depth of 30 metres, with visibility ranging from 15 to 30 metres. Divers should note the presence of sharp coral and rocks, particularly near the surface structure where surge can occur. Access is by boat only, and the site is suited for intermediate divers due to the varied terrain and potential for entanglement near wreck materials. Typical dives last around 45 minutes, with mild currents generally present throughout the area.
18.44817, -64.81253
Arrive by boat and watch for surge near the rock's surface structure, as sharp coral and exposed rock can catch you off guard during entry or ascent. Scout the cavern recesses early in the dive before other boats arrive and any silt gets disturbed.
Access info coming soon
Recorded nearby, within 20km
Depth
8-30m
Visibility
15-30m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
27-30°C
Current
Mild
Typical Dive
45 min
The site supports a variety of reef species, including green sea turtles in the shallows, nurse sharks in the caverns, and queen angelfish and fairy basslets along the reef.
No, Mercurius Rock is rated for intermediate divers due to the complex topography of caves and caverns, as well as the need to navigate sharp coral and potential surge.
The site features a depth range of 8 to 30 metres, with an average depth of 9 metres.
Boat access is required to reach Mercurius Rock.
While the pinnacle rises to 8 metres, the site is primarily designated for diving due to the depth and the nature of the underwater structures.
Diving at Mercurius Rock in Cruz Bay requires the following certifications: Open Water. Always dive within your training limits.
A rashguard or 2mm shorty is recommended for diving at Mercurius Rock in Cruz Bay. Water temperatures range from 27°C to 30°C.
Mercurius Rock in Cruz Bay typically has mild currents that most divers can handle comfortably.
Visibility at Mercurius Rock in Cruz Bay typically ranges from 15 metres to 30 metres. Conditions vary with weather, tides, and seasons.