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Operator dive-site page with advanced certification, safety-stop, and visibility guidance.
Dive Spot Guide•
Siaes Tunnel
Advanced Palau cavern dive with a light-filled tunnel.
Speedboat access from Koror; plan for advanced overhead diving, conservative gas management, and tide-sensitive visibility.
About Siaes Tunnel
Siaes Tunnel is a boat-access advanced dive on the northwest side of Ulong Island, usually reached in a 30 to 45 minute speedboat run from Koror. The site is a large overhead cavern with multiple reef-wall openings, so the plan is a deliberate guide-led descent rather than a casual reef drift. Light, black coral, reef sharks, and stingrays make it a standout Palau tunnel dive.
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Where Is Siaes Tunnel?
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Community sourced coordinates.
Siaes Tunnel Planning Details
Depth range, seasonality, and planning context.
Reported Depth
28m - 45m
Depth Note
Cavern entrance at 28 m with a stated depth of 45 m.
Best Season
Year-round; January to April is busiest.
Typical Conditions
Large overhead cavern with natural light through multiple openings and a calm interior once you are inside.
Safety & Access At Siaes Tunnel
Hazards, restrictions, and access requirements.
Key Hazards
Overhead environment
Safety Notes
This is an overhead cavern dive; advanced training, conservative gas planning, and a mandatory safety stop are important.
Access Restrictions
Advanced open-water certification minimum; deep diving experience is strongly recommended.
Legal Notes
A three-minute safety stop is mandatory, and the dive should stay within a conservative overhead profile.
Local Intel For Siaes Tunnel
Community notes to help plan your visit.
Scuba Diving
Large underwater cavern dive with an entrance around 28 m and depth to about 45 m.
Freediving
Not suitable for freedive use because the tunnel is a deep overhead cavern.
Snorkeling
Not a snorkel-first site; the main feature sits well below comfortable surface viewing.
Recent Logged Visits At Siaes Tunnel
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Siaes Tunnel
Average conditions based on logged dives & visits.
No community dive data has been logged here yet. Be the first to record a dive and seed the averages.
