Gordon Rocks
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.
Gordon Rocks is the best big-animal dive available without boarding a liveaboard: an eroded tuff crater off northeastern Santa Cruz whose rim breaks the surface in three stacks. Inside, the crater floor sits around 32 m; the action concentrates along the rim, where scalloped hammerheads patrol singly or in small schools and eagle rays hold formation against the flow. Sea lions dive-bomb safety stops, turtles wedge into the rock to be cleaned, and the current - the site's engine and its hazard - can shift mid-dive. Locals call it the washing machine without exaggerating much. Day boats run it regularly from Puerto Ayora, making it many divers' first hammerhead encounter.
The moment you come for: Hammerheads on a day trip, eagle rays stacked in current, sea lion buzz-bys
Topography: Submerged volcanic crater rim with sand at depth inside
Current: The eroded crater funnels tide through gaps in the rim - down-currents happen, which is why day boats vet experience.
Know before you splash
Hazards: Down-currents and washing-machine turbulence at the rim gaps; surge near the stacks.
Conservation: Within the Galapagos Marine Reserve; guided groups only.
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
Galápagos Sea Lion
Green Sea Turtle
Scalloped Hammerhead
Spotted Eagle Ray
For photographers
Wide angle: ★★★★☆ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting