Siaes Tunnel

Type:

Scuba Diving

Entry:⚓Boat Entry

Difficulty:Advanced

Tags:

CaveDeepReef

About This Dive Spot

Siaes Tunnel is a boat-access dive site about 30–40 minutes from Koror. It features a large underwater cavern with an entrance around 28 m and a maximum depth near 45 m. Black coral can be seen near the top of the cavern, and divers may encounter whitetip reef sharks in the surrounding area.

Planning details

Reported depth and seasonality.

Reported depth

28m - 45m

Depth note

Cavern entrance at 28 m with a stated depth of 45 m.

Safety & access

Hazards, restrictions, and required precautions.

Hazards

Overhead environment

Safety notes

This is an overhead cavern dive with depths to about 45 m; appropriate training and gas planning are important.

Local intel

Community notes to help plan your visit.

Tailored notes for different activities.

Scuba

Large underwater cavern dive with an entrance around 28 m and depth to about 45 m.

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Dive Conditions Planner

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Spots Near Siaes Tunnel

📍 4.8 km

Ulong Channel

⚓

Ulong Channel is a drift dive on the western side of Ulong Island, featuring coral formations and sea fans along the channel. The dive is shallow, with reported depths between 3 and 13 meters. Divers may encounter schooling snappers alongside barracudas, jacks, and sharks. Access is by boat.

📍 6.8 km

Ulong Sandbar

Not Set

Ulong Sandbar is a shallow dive site reaching up to 20 m depth. It features a mix of hard corals including staghorn and elkhorn, along with soft corals. Fish life is described as plentiful, with sightings that can include juvenile fish, anemonefish, yellow leaf fish, chromis, and tube eels.

📍 7.4 km

Ulong Wall

Not Set

Ulong Wall is a wall dive in Palau, featuring steep drop-offs along the reef. The site is known for encounters with larger reef and pelagic species while following the wall. The dive reaches around 25 m and is described as best suited to experienced divers.

📍 20.0 km

Blue Corner Palau

⚓

Blue Corner Palau is a boat-access dive site with depths ranging from 8 to 30 meters. It is known for encounters with large pelagic species and active reef life. Divers may see reef sharks, bull sharks, and manta rays.

📍 22.3 km

German Channel

⚓

German Channel is a dive site known for frequent manta ray encounters, with mantas commonly visiting cleaning stations in the channel. Divers may observe mantas interacting with wrasses at these stations. The site reaches about 20 m depth and can experience strong currents, so planning and situational awareness are important.

📍 22.3 km

Clam City

⚓

Clam City is a shallow dive site reached by a short boat ride from the main hub area. The site sits around 10 m and is known for very large giant clams, including older individuals. Divers can also expect a reef setting with staghorn coral and sizable Porites coral heads, plus schooling reef fish such as anthias, sergeant majors, Chromis, and Moorish idols.

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Frequently Asked Questions

What's the best entry point at Siaes Tunnel?

Entry at Siaes Tunnel is detailed in the spot description above. Look for specific landmarks, access paths, and any tide or condition requirements. Local divers often share updated entry tips in their dive logs.

What conditions are best for diving Siaes Tunnel?

Optimal conditions at Siaes Tunnel depend on several factors including tide, wind, and season. Check recent dive logs for current condition reports and patterns. Generally, calmer seas and high tide provide better visibility and easier entry.

What is the maximum depth and typical visibility at Siaes Tunnel?

Depth and visibility information for Siaes Tunnel can be found in the spot details and recent dive logs. Conditions can vary significantly based on weather, tide, and season. Always plan your dive according to current conditions and your certification level.

Are there any safety considerations or local etiquette at Siaes Tunnel?

When diving Siaes Tunnel, respect local regulations, marine life, and other water users. Be aware of any specific hazards like currents or boat traffic mentioned in the spot description. Follow Leave No Trace principles and local diving etiquette.