Siaes Tunnel
A huge underwater tunnel through the outer reef wall on the west side of the Rock Islands, with black coral and sea fans inside and a deep-blue exit. It is one of Palau's famous advanced dive sites.
Siaes Tunnel is a massive underwater cavern through the western outer reef wall, north of Ulong Island. The entrance is at about 27 meters, and the interior is wide, with black coral, sea fans and soft gorgonians hanging from the ceiling. The exit opens onto a blue hole where the reef drops away into deep water, and shooting toward the light from inside is spectacular. Because of its depth, it suits experienced divers with advanced certification, and it is often combined with a drift dive at Siaes Corner. It is about a one-hour speedboat ride from Koror, and the cost is included in dive packages.
Opening hours
Depends on dive shop schedule
Nearby sights
- Ulong Island & Ulong Channel
- Seventy Islands (Ngerukewid Islands)
- Rock Islands Southern Lagoon
- Milky Way
- Blue Corner
- Long Beach (Omekang Sandbar)
- German Channel
- Big Drop-off (Ngemelis Wall)