Galapagos: Diving Darwin's Islands

The Archipelago's Geography

The Galapagos Islands are a volcanic archipelago 1,000 km off the coast of Ecuador, straddling the equator but influenced more by cold currents than warm ones. Three major ocean currents converge here — the Humboldt (cold, from the south), the Cromwell (deep, equatorial, upwelling), and the Panama (warm, from the north) — producing a marine ecosystem of extraordinary biodiversity.

For divers, the critical geography is the position of Darwin Island and Wolf Island in the archipelago's extreme north — 120 km and 188 km north of the nearest inhabited island respectively. Reaching them requires a 14-18 hour overnight liveaboard crossing from Puerto Ayora (Santa Cruz Island). There are no day trips. This is liveaboard-only diving.

Darwin's Arch and Darwin Island

Darwin's Arch — a natural rock arch rising from the sea at Darwin Island's northern end — is the most famous dive site in the Galapagos. The arch collapsed in 2021 (two of the pillars failed), but the dive site remains exceptional.

The underwater structure is a submerged plateau at 20-30 metres where the Cromwell Upwelling concentrates nutrients and, consequently, sharks. On a productive day at Darwin:

• Scalloped hammerhead sharks (Sphyrna lewini) school in formations of hundreds — sometimes thousands — circling the plateau in slow revolutions
• Whale sharks (Rhincodon typus) — almost exclusively large females, many appearing heavily pregnant — cruise past the reef edge at 18-25 metres
• Galapagos sharks (Carcharhinus galapagensis) patrol the perimeter
• Silky sharks in open water above the plateau

Wolf Island: Similar, Different

Wolf Island is 30 km from Darwin, with dramatic vertical walls, large schools of jacks and barracuda in addition to the sharks. Wolf is also where vampire finches have been documented feeding on the blood of Nazca boobies — an unlikely evolutionary adaptation documented since the 1960s.

The Cold and the Challenge

Galapagos diving is cold. Water temperature ranges from 18 degrees C (June-November at Cromwell upwelling sites) to 24 degrees C (December-May at the surface). A 7mm wetsuit with hood is required for Darwin and Wolf at peak upwelling season.

Currents at Darwin and Wolf are strong and variable. The dive protocol is drop-and-drift — the liveaboard positions upwind or upcurrent, divers enter and allow the current to carry them over the site, then the tender picks them up.

Best season: December-May for clearer water and more whale sharks; June-November for bigger hammerhead aggregations.