Coral Caverns

The cavern system

Tidal flow over millennia has etched the base reef into a complex network of interconnecting tunnels and cathedral-like chambers. Unlike true caves, these caverns have multiple openings that allow natural light to filter through, creating the sun-dappled effect that makes this site so photogenic.

The passages vary in size from intimate swim-throughs to spacious chambers where multiple divers can gather. The walls are covered in encrusting corals and sponges, while the cavern floors hold scattered rubble and sand that provides habitat for crustaceans and bottom-dwelling fish.

Silverside spectacle

The caverns serve as shelter for enormous schools of silversides, small silver fish that aggregate in dense clouds within the protected passages. When present, these schools create living curtains of fish that swirl and flow around divers, parting and reforming in hypnotic patterns.

The silverside aggregations attract predators including tarpon, jacks, and reef sharks, creating opportunities to witness predator-prey interactions within the confined cavern spaces. The spectacle is most impressive during summer months when silverside numbers peak.

Marine life and topside coral

Above the cavern level, the reef top hosts healthy stands of elkhorn coral alongside brain coral, star coral, and sea fans. This shallow zone is accessible during safety stops and adds variety to the dive profile.

Within and around the caverns, divers regularly encounter eagle rays gliding past the openings, hawksbill turtles resting in the recesses, and grouper that have become accustomed to divers. The resident grouper known as Calypso is particularly friendly, often approaching dive groups.

Getting there

Coral Caverns is accessed via dive boat from Green Turtle Cay, typically through Brendal's Dive Center or Green Turtle Club Resort. The site is a short boat ride from New Plymouth harbour. Visiting sailors can arrange dive trips through the resort or explore by dinghy with appropriate snorkelling gear for the shallower sections.

Frequently asked questions

When are silversides present at Coral Caverns?

Silverside aggregations are typically largest during summer months, roughly June through September. Outside this period, the caverns remain impressive but may have fewer schooling fish.

Do I need cavern certification to dive Coral Caverns?

No. The site features open caverns with multiple exits and natural light throughout. Standard open water certification is sufficient, though comfort with enclosed spaces is recommended.

How deep is the reef top at Coral Caverns?

The elkhorn coral gardens above the caverns begin at around fifteen to twenty feet, making them accessible for snorkellers and ideal for extended safety stops.