Siaes Tunnel

Palau, Palaucave50 m maxadvanced

Conditions & tides

Channel site — tidal current funnels through here and can run fast, changing quickly with the tide. It is usually strongest around mid-tide and eases near the slack windows below. Dive with a local operator who knows the timing.

Siaes TunnelPalau

Good · 5/5

conditions visualisation

Good5/5

Calm and diveable right now — best window today 6 AM–4 PM.

Wind12 kn E

Current~0 kn W · model

Swell

0.7 m · 6s · NNE

Water

30 °C

Max depth

50 m

Conditions through the day

5 AM5 PM

Calmest current near slack — 12:00 & 00:30 local

Sunrise 05:52 · Sunset 17:41 local

Show details

Tide · local

Outlook — select a day for full conditions

On-face swell 0.3 m — the component of the swell aimed at this site’s exposed face. Strong-current reef: plan a drift and enter near the slack windows above. Current is a regional model value (Copernicus, ~9 km grid) — a guide to the area, not a precise reef measurement. Imagery © Esri · not depth or visibility.

Scored by DiveConnect's site-physics model

Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.

Dived here today? How were conditions vs. what we showed?

About this site

Siaes Tunnel is a deep cave dive in Palau, set in the middle of the vertical wall on the outer reef. You follow the wall down, and once you pass about 30 m (98 ft) a large dark opening appears in the side of the cliff.

The tunnel runs for roughly 50 m (164 ft) and is wide and tall enough for several divers to swim side by side, with a domed roof. The sand floor sits at about 50 m (164 ft) at the entrance and drops deeper further in, so the site is only reachable on a deep dive, and nitrogen narcosis is a real concern. The tunnel has two exits, and large gorgonian sea fans grow at the exit.

Visibility is 15 to 30 m (50 to 100 ft) or better and there is no current. Sunlight enters through the mouth and makes shafts of light in the entrance. The classic view is looking back out from inside, where divers swimming out are framed as silhouettes against the blue. The site suits advanced divers with Advanced Open Water training and Nitrox.

AI-written site guide