Submerged Rock
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Submerged Rock never breaks the surface - the swell marks it with a boil on big days - and its underwater profile is a gift: a pinnacle drilled clean through by a swim-through at around 15-18 m, lined with encrusting color and packed with fish waiting out the current. Whitetips stack inside the tunnel and under every overhang, eagle rays and marbled rays orbit the base, and hammerheads make wider circuits out in the blue. Because the interesting depth band is shallower than at the marquee seamounts, it often serves as a second or third dive that ends up out-delivering the first.
The moment you come for: The swim-through, dense whitetips, rays orbiting a tower of rock
Topography: Pinnacle rising to just below the surface, pierced by a swim-through
Current: More forgiving than the outer seamounts, though swell finds it easily.
Know before you splash
Hazards: Surge in and around the swim-through; keep the tunnel passage brief and orderly.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Marbled Ray
Scalloped Hammerhead
Spotted Eagle Ray
Whitetip Reef Shark
For photographers
Wide angle: ★★★★☆ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting