The Tunnel (Dalyan) – Fethiye & Ölüdeniz Dive Site
Site Overview
The Tunnel (Dalyan) is one of Fethiye & Ölüdeniz's most remarkable dive sites, offering unique freshwater and saltwater interface cavern dive at 15 to 25 metres with marble rays. The site's healthy marine ecosystem supports diverse fish populations and vibrant underwater formations throughout the diving season, creating an underwater landscape that rewards repeated exploration by both new and experienced divers alike. With warm Mediterranean water temperatures and exceptional visibility depending on conditions and season, The Tunnel (Dalyan) provides excellent conditions for underwater exploration across all certification levels throughout the year. The site's diverse topography creates multiple habitat zones supporting different species at various depths, from shallow rocky reefs teeming with colorful fish to deeper sections where larger species patrol the structure looking for prey. Turkey's strategic position at the crossroads of Europe and Asia ensures a unique blend of Mediterranean and temperate marine influences contributing to the vibrant communities found at this location. Nutrient-rich waters sustain abundant filter-feeding invertebrates including gorgonian sea fans, sponges, and colorful soft corals that add spectacular color and texture to the underwater scenery. Whether exploring dramatic walls and pinnacles or observing larger pelagic visitors cruising past the formation, The Tunnel (Dalyan) consistently delivers memorable and rewarding underwater experiences for all who dive here.
Dive Briefing
"Begin the dive at the shallowest point of The Tunnel (Dalyan) and take a moment to orient yourself before descending along the cavern with halocline creating surreal visual effects. Maintain excellent buoyancy throughout the dive to protect the fragile marine formations and diverse life inhabiting the site. Swim along the formation exploring the various depth zones while observing the diverse habitats and marine species that occupy each zone. Check overhangs, ledges, and crevices for resting moray eels, octopus, and cryptic species that shelter from the current. Pay special attention to the rocky outcrops, sandy patches, and reef edges where smaller species like seahorses, nudibranchs, and frogfish can be found with careful observation. Monitor your depth and remaining NDL carefully throughout the dive and maintain conservative ascent profiles. Keep your dive buddy in visual contact and communicate regularly using standard hand signals. Complete your safety stop at 5 metres while deploying your DSMB before making a controlled ascent to surface."
Signature Marine Life
marble ray
Best: May, June, July
sea turtle
Best: May, June, July
diverse Mediterranean fish
Best: May, June, July
marine invertebrates
Best: May, June, July
benthic species
Best: May, June, July
Safety & Hazards
- Overhead environments in caves and caverns requiring torch use and cavern or cave diving certification
- Reduced visibility inside cave systems from silt disturbance requiring buddy contact and guideline awareness
- Disorientation risk in cave environments requiring calm behaviour and pre-dive orientation briefing
- Thermal layers in cave systems causing sudden temperature changes requiring appropriate exposure protection
- Limited exit points in cave environments requiring redundant gas supply and conservative dive planning
Traveler Notes
Who is this for?
The Tunnel (Dalyan) is suitable for all certification levels including beginners, offering rewarding encounters with diverse marine life in Turkey's productive waters. Underwater photographers will find excellent opportunities with the diverse topography and abundant subjects, from nudibranchs and frogfish to schooling pelagics and colourful gorgonian fans. The site rewards both wide-angle and macro photography approaches depending on the conditions and subjects encountered. Divers with an interest in marine biology will appreciate the Mediterranean biodiversity on display, while those seeking relaxing reef and wall dives will find calm conditions and beautiful scenery.
For Non-Divers
Non-divers can enjoy beautiful beaches, ancient historical sites, snorkelling, and cultural tours near the dive location.
Quick Stats
Dive Logistics
- Local Dive Center
Photography Info
Best for: wide_angle
Nearby Stay
Dive Resort
Fethiye & Ölüdeniz • 3km away
Beach Hotel
Fethiye & Ölüdeniz • 2km away