Coral Triangle · Philippines
Siargao
Blue Cathedral, a Pacific cavern swept by schooling jacks and barracuda
Siargao is a surf island on the Philippine Sea with a small dive scene run out of General Luna on its southern coast. Sheltered bay reefs such as Secret Garden and Daku Arch sit between 3 and 20 m, while Shark Point and Pilar Twin Rocks face open water. What brings divers here is Blue Cathedral, a Pacific cavern that drops to 40 m and fills with schooling jacks and barracuda.
About diving in Siargao
Dives run by speedboat from General Luna. The boats reach the bay sites in 10–20 minutes and the Pacific-facing sites in 20–35 minutes, depending on swell, and no liveaboard is based on the island. Site availability varies with weather and sea state. All sites sit inside the Siargao Island Protected Landscape and Seascape, and diving is confined to its multiple-use zones, with the strict protection zones closed to divers.
The bay reefs are shallow, calm and coral-covered, with nudibranchs, ghost pipefish, frogfish, ribbon eels, scorpionfish, cuttlefish and octopus. Around Daku Island fusiliers, snappers, parrotfish and angelfish gather in dense aggregations. Outside, the character changes: Shark Point slopes into a wall, Pilar Twin Rocks pulls in pelagics on the current, and Blue Cathedral is an open cavern where schools of jacks, trevally and barracuda move through the interior, fish that the calmer bay sites lack.
The bay suits new divers, students and macro photographers, with minimal current and depths that stay inside Open Water limits. The Pacific sites are another matter. Currents and surge there change with swell and tide, and at Pilar Twin Rocks, beyond the reef edge and at the mouth of Blue Cathedral they can run hard during tidal changes with little warning from the surface; strong currents have caused deaths around the island. The nearest recompression chamber is in Cebu City, and an emergency means an air evacuation from Sayak Airport.
Best time to dive Siargao
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fair | Fair | Prime | Prime | Prime | Good | Good | Good | Good | Good | Fair | Fair |
The year opens in the northeast monsoon. From November to February bay diving continues while the Pacific sites are less predictable, and the period brings typhoon risk, rougher seas, stronger currents and visibility down to 5–15 m. March to May is the best stretch for every site, with the calmest seas, the clearest bay water and the smallest swells outside. June to October brings the southwest monsoon: bay sites hold up while Pacific sites take more swell. From September the surf season roughens the east coast, while sites on the General Luna side stay diveable.
Dive types & marine life
Green turtles appear on near-daily dives and whitetip and blacktip reef sharks are seen regularly at Shark Point, though not guaranteed. Mandarinfish are residents found on night dives. Eagle rays are only occasional at Blue Cathedral.
- Cave & cavern
- Wall
- Coral garden
- Muck & macro
- Night
- Reef sharks
- Sea turtles
- Trevally & jacks
- Barracuda
- Eagle rays
- Mandarinfish
- Frogfish
- Nudibranchs
- Octopus & cuttlefish
Best dive sites in Siargao
- 1
Blue Cathedral
Pacific cavern with working depths around 35 m and visibility past 80 m on calm days.
- 2
Shark Point
Sloping reef turning to wall, where whitetip and blacktip reef sharks rest and patrol.
- 3
Secret Garden
Three linked shallow reefs near Naked Island with a resident pink frogfish and mandarinfish at night.
- 4
Daku Arch
Submerged rock arch to swim through in hard and soft coral, calm and sheltered at 10–20 m.
- 5
Casulian Reef
Well-preserved hard coral garden where green turtles rest on the reef most days.
- 6
Pilar Twin Rocks
Twin rocks whose upwelling draws jacks and the odd eagle ray, best on an outgoing tide.
Site guides
Cave & cavern
An open Pacific cavern where schooling jacks and barracuda move through
Coral garden
Dense, well-preserved hard coral cover on an easy, relaxed reef
Reef
A submerged rock arch to swim through, framed by hard and soft corals
Reef
A coral reef beside a surf break, falling to sand in the channel
Reef
A resident pink frogfish on three linked reefs near Naked Island
Wall
Whitetip and blacktip reef sharks resting on the reef and patrolling the wall
How to get to Siargao
Flights land at Sayak Airport (IAO) in Del Carmen, 45–60 minutes by road from General Luna. Ferries also run from Surigao City to Dapa, the island's main port, which is about 30 minutes from General Luna by tricycle or habal-habal. The dive centres are based in General Luna.
Dive videos
Siargao scuba diving, The incredible Two Towers dive site · Kev_diving on YouTube
Questions divers ask
What certification is needed for Blue Cathedral?+
Advanced Open Water, plus a check dive at a bay site first. The cavern reaches 40 m and takes Pacific currents and surge when the swell is up.
When is the best time to dive Siargao?+
March to May, when seas are calmest, the bay is clearest and the Pacific swell is smallest. It is also the most reliable window for Blue Cathedral.
Can beginners dive Siargao?+
Yes. Secret Garden and Casulian Reef stay within 18 m with little current and suit newly certified divers; the Pacific sites are better left until more experience is logged.
How do divers get to Siargao?+
By air to Sayak Airport in Del Carmen, then 45–60 minutes by road to General Luna, or by ferry from Surigao City to Dapa. Every dive leaves General Luna by speedboat.
Sources
- Siargao Dive Guide: Blue Cathedral & Reef Walls — PhilippineDives.com
- Snorkeling & Diving in Siargao: Reef Sites, Marine Life & Dive Shops 2026 — Mariden Resort and Homestay Siargao
- Siargao — Wikivoyage
- Palaka Siargao - Boutique Resort and Diving Center — Palaka Resort
- Emerald House Village Siargao — Emerald House Siargao
Embed
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