Cascais – The Walls of Boca do Inferno – Mainland – Lisbon / Cascais / Arrábida
Site Overview
Boca do Inferno is the underwater continuation of Cascais’s famous cliff, with caves, arches and morays in moderate current. An advanced entry dive close to Lisbon. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life. The site rewards careful planning, good buoyancy and a respect for Portuguese marine-protection rules, and remains a favourite among Atlantic divers who value dramatic scenery and rich marine life.
Dive Briefing
"Boat to the cliffs and descend in a current-friendly entry, exploring the arches and caves with a torch, then ascend with a safety stop. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable. Follow your guide closely, monitor your thermal comfort and complete a safety stop before exiting at the designated point to keep the dive safe and enjoyable."
Signature Marine Life
Moray Eel
Muraena helena
Best: Year-round
Nudibranch
Chromodoris spp.
Best: Year-round
Gorgonian Coral
Paramuricea clavata
Best: Year-round
Wrasse
Labridae
Best: Year-round
Octopus
Octopus vulgaris
Best: Year-round
Safety & Hazards
- Moderate currents
- Surge at entry
- Sharp cliffs
- Limited visibility after swell
- Boat traffic
Traveler Notes
Who is this for?
For advanced divers near Lisbon who enjoy cliff walls and arches. It suits explorers and photographers. It suits confident Atlantic divers who value dramatic scenery, wrecks and rich marine life over tropical abundance and who plan their trips around the best seasonal windows. It suits confident Atlantic divers who value dramatic scenery, wrecks and rich marine life over tropical abundance and who plan their trips around the best seasonal windows. It suits confident Atlantic divers who value dramatic scenery, wrecks and rich marine life over tropical abundance and who plan their trips around the best seasonal windows.
For Non-Divers
Non-divers can enjoy boat trips, coastal walks and local cuisine while divers explore the site.
Quick Stats
Dive Logistics
- Cascais Divers
Photography Info
Best for: wide_angle, macro