Siaes Tunnel

Best time to dive

January to December; November to April

What you might see

• Grey reef sharkLikely
• Sea turtlePossible

Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.

Certification & difficulty

Advanced Open Water - advanced conditions (currents/depth); dive within your training.

Snorkelling

Not a snorkel site - No - depth and cavern/tunnel nature make this a certified-diver-only site

Safety notes

Overhead/cavern penetration, significant depth (nitrogen loading), mandatory safety-stop discipline, strict gas and bottom-time planning required, surge near tunnel openings

Permits & fees

PPEF $100 USD (airline ticket); Rock Islands/Koror State reef access permit applies - confirm current fee with operator

Permits and operators change - confirm before booking.

Location

Nearest hub: Koror