About this spot
Siaes Tunnel ranks among Palau's most thrilling drift dives. The site features a natural tunnel carved through limestone, descending steeply from the shallows into the blue. Advanced divers enter the passage and drift through, exiting into deeper water where the current carries you away from the reef. The tunnel itself creates dramatic lighting and rock formations that make for striking visuals underwater. The dive demands solid buoyancy control and experience in strong current environments. Proper weighting and streamlined technique are essential—this is not a beginner-friendly site. Most dives here are current-dependent; conditions can change quickly, and local knowledge matters. The depth progression (25–35 metres) requires nitrox certification or comfort with air limits at that range. Palau's year-round warmth means Siaes works in most seasons, though local operators can advise on current patterns and visibility swings throughout the year. The tunnel's geological drama and the thrill of high-speed drift make it a standout for experienced divers seeking something beyond standard wall or coral-garden dives. Community footage captures the passage's scale and the rush of the current dive experience.
Best months
Dive types
Trip essentials
Everything you need before you pack — checklist, sun, logistics.
Trip checklist
- 🛂 Visa-free or visa-on-arrival
- 📜 C-card + dive insurance (DAN)
- 📔 Dive logbook
- 🧴 Reef-safe sunscreen SPF 50+
- 💊 Seasickness meds + ear drops
- 📱 Offline maps + emergency contact
Quick facts
- 🌓 Moon First quarter · 48%
- GPS
› Sustainability disclosures
FAQ
›When is the best time to dive Siaes Tunnel?
Palau offers diving year-round. Current strength and visibility vary seasonally; contact local dive operators for current conditions and optimal windows for Siaes Tunnel dives.
›What depth and skill level is required?
Siaes Tunnel is an advanced dive dropping to 25–35 metres. Divers need solid buoyancy, current-diving experience, and comfort at depth. Nitrox or air-limit awareness is recommended.
›What marine life might I encounter?
Palau's reefs host pelagic fish, sharks, rays, and schooling species. The tunnel and current zone attract open-water species. Specific species logs for Siaes Tunnel are not published; ask your operator about recent sightings.
›How do I access the dive and are permits needed?
Siaes Tunnel is accessed via boat from Palau's main islands. No special MPA restrictions apply to this site. Book with a licensed dive operator; they handle logistics and current assessments.
