Ons – Cueva de la Gata – Galicia – Rías Baixas & Costa da Morte
Site Overview
The Cueva de la Gata is a sea cave on the island of Ons within the Atlantic Islands reserve, its chamber glowing with glassfish and sheltering lobsters and morays among the granite. Advanced divers explore the overhead environment with a torch, while careful buoyancy keeps the silty cave pristine. The protected status and permit system ensure a calm, uncrowded experience, and the clear cool water makes the light play beautiful. Cueva de la Gata is a highlight of the Ons coastline. The site rewards careful planning, good buoyancy and respect for Spain’s marine-protection rules, and remains a favourite among divers who value dramatic volcanic or Mediterranean scenery, historic wrecks and rich marine life across a long, varied season. The site rewards careful planning, good buoyancy and respect for Spain’s marine-protection rules, and remains a favourite among divers who value dramatic volcanic or Mediterranean scenery, historic wrecks and rich marine life across a long, varied season. The site rewards careful planning, good buoyancy and respect for Spain’s marine-protection rules, and remains a favourite among divers who value dramatic volcanic or Mediterranean scenery, historic wrecks and rich marine life across a long, varied season. The site rewards careful planning, good buoyancy and respect for Spain’s marine-protection rules, and remains a favourite among divers who value dramatic volcanic or Mediterranean scenery, historic wrecks and rich marine life across a long, varied season.
Dive Briefing
"Take the permitted boat to Ons and descend to the cave mouth at 6 m. Enter with a torch, staying neutrally buoyant to protect the chamber, and watch for lobsters and glassfish. Exit and ascend with a safety stop in open water. Follow your guide closely, monitor your air and thermal comfort, watch your depth and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your air and thermal comfort, watch your depth and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your air and thermal comfort, watch your depth and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your air and thermal comfort, watch your depth and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable."
Signature Marine Life
Lobster
Palinurus elephas
Best: Year-round
Glassfish
Parapristipoma spp.
Best: Year-round
Moray Eel
Muraena helena
Best: Year-round
Octopus
Octopus vulgaris
Best: Year-round
Nudibranch
Chromodoris spp.
Best: Year-round
Safety & Hazards
- Overhead environment
- Current on the site
- Kelp entanglement
- Cold water
- Permit rules
Traveler Notes
Who is this for?
Best for advanced divers comfortable in overhead environments who want a lit sea cave with crustaceans. It attracts wide-angle photographers and experienced explorers. Training divers build cavern skills here under supervision. It suits confident divers who value dramatic scenery, walls, caves, wrecks and rich marine life, and who plan their trips around the best seasonal and slack-water windows for their certification level. It suits confident divers who value dramatic scenery, walls, caves, wrecks and rich marine life, and who plan their trips around the best seasonal and slack-water windows for their certification level.
For Non-Divers
Non-divers can enjoy boat trips, coastal walks, beaches and local cuisine while divers explore the site.
Quick Stats
Dive Logistics
- Ons Diving
- Galicia Dive Center
Photography Info
Best for: wide_angle, macro
Nearby Stay
Local Dive Lodge
Baiona • 3km away
Coastal Guesthouse
Baiona • 5km away