Dilumacad Tunnel
Also known as: Helicopter Island Tunnel
Best time to dive
November to May
What you might see
- Manta rayPossible
- Moray eelLikely
- NudibranchLikely
- Sea turtleLikely
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 - swim-through tunnel requires scuba; reef around the island is snorkelable
Safety notes
Narrow overhead passage (especially exit), no mooring at site, unsafe in strong north winds/swell, silt-out risk for careless finning
Permits & fees
El Nido Eco-Tourism Development Fee (ETDF): PHP 200/person (non-Palawan resident, valid 10 days) or PHP 500 (extended stay); Palawan residents PHP 100, students PHP 50 - required for Bacuit Bay island/dive access
Permits and operators change - confirm before booking.
Location
Nearest hub: El Nido
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.