Invisible Bank

Submerged seamount about 100 km southeast of Havelock Island, where a flat rock crests within 8 m of the surface before its slopes drop past 30 m onto a sand and rubble base. Far from any sheltering land, the site is wholly exposed and the current can rip, but the trade off is pelagic density few Indian Ocean sites match. Dense schools of dogtooth tuna, bluefin and giant trevally, great barracuda, and unicornfish swirl over the rocks while grey reef sharks, whitetips, and resting nurse sharks patrol below. Bumphead parrotfish and napoleon wrasse work the structure, and scalloped hammerheads are sighted on lucky days in late winter. Visibility regularly hits 30 to 40 m. This is an advanced liveaboard dive that runs only when surface conditions cooperate.