Isabela Island Los Tuneles

Puerto Villamil · Galapagos Islands · Ecuador

Los Tuneles sits off the southern coast of Isabela Island, the largest landmass in the Galapagos archipelago, where ancient lava flows from the Sierra Negra volcano reached the Pacific and created something extraordinary. Collapsed lava tubes form a labyrinth of natural arches, bridges, and channels both above and below the waterline, and this sheltered volcanic maze has become one of the most wildlife-dense dive sites in the entire Galapagos marine reserve. The 45-minute boat ride from Puerto Villamil crosses open ocean that can be rough, especially during the garua season from June to November. But arrival at Los Tuneles feels like entering another world. Volcanic rock formations rise from turquoise shallows, creating a network of pools and channels where blue-footed boobies nest on the exposed arches while marine life thrives beneath. I descended through a natural archway into a shallow channel between collapsed tubes, and the density of life was immediate. Three green sea turtles rested on the sandy bottom within the first minute, entirely unbothered by my presence. White-tip reef sharks lay in groups under lava overhangs, stacked like cordwood in their preferred resting spots. The Galapagos's strict protection regime means animals here show virtually no fear of divers. Los Tuneles is one of the best locations in the Galapagos for Pacific seahorses, which cling to gorgonian fans and black coral branches in the sheltered channels. I found three individuals on a single dive, their camouflage so effective that without the guide's eye I would have missed them entirely. The macro life complements the megafauna: nudibranchs, decorator crabs, and frogfish inhabit the lava crevices. Marine iguanas graze on algae-covered rocks at the waterline, diving beneath the surface to feed and surfacing to warm themselves in the equatorial sun. Galapagos penguins dart through the shallows hunting small fish, their underwater speed absurdly fast compared to their waddling terrestrial movement. During the cool season, ocean sunfish drift into the channels for cleaning, their bizarre disc-shaped bodies hovering near cleaning stations.