Blue Cathedral
Protected Area
Siargao Islands Protected Landscapes and Seascapes (SIPLAS)
Why dive here
With 82+ marine species recorded in the area - including manta rays, mobula rays (devil rays), whale sharks and pufferfish - Blue Cathedral offers some of Siargao's richest cave diving. Water ranges 27-30°C, warmest June, August, September.
Blue Cathedral is exactly what it sounds like: a large underwater cave off Siargao, dropping to 34m. We found the main chamber impressive, with light shafts cutting through the gloom on clear days. It's an intermediate dive, best for those comfortable with overhead environments and deep entries. Keep an eye out for resident groupers and barracuda patrolling the mouth.
Typical Blue Cathedral Dive Profile
Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.
Safety Notes
Deep dive (34m) - monitor air consumption closely. Advanced certification recommended.
Overhead environment - never enter without proper cave/cavern training, redundant equipment, and a guideline.
Always perform a 3-minute safety stop at 5m before surfacing.
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Conditions
Ocean conditions, forecast and tides for Blue Cathedral
Blue Cathedral Ocean Conditions
Monthly averages for Blue Cathedral, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (8.91, 125.03) (20km away)
October Averages
Sea Temperature
30°C
86°F · Range: 29.2–31.2°C
Current Speed
1 cm/s
Direction: S (180°)
Chlorophyll-a
0.333 mg/m³
Moderate productivity
Salinity
32.39 PSU
Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)
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