Sanma Province dive sites

The Cathedral is classified as a cavern dive rather than a cave dive because natural light is visible throughout the dive from the entrance and ceiling openings. Full cave diving certification is not required. However, divers should hold at minimum an Advanced Open Water certification and be comfortable in overhead environments. Good buoyancy control is essential to avoid disturbing sediment on the cavern floor and maintain visibility. Most local operators conduct an orientation briefing covering cavern-specific safety procedures. Divers unfamiliar with overhead environments should consider taking a cavern diving specialty course before visiting.

The spectacular light effects at The Cathedral are best observed between 10 in the morning and 2 in the afternoon when the sun is high enough to send concentrated beams through the ceiling openings into the chamber. The most dramatic effects occur during the dry season from April to November when skies are clearest. Overcast days significantly reduce the light show. The light beams are visible year-round during sunny conditions, but the angle and intensity vary with the season and time of day. Local dive operators schedule Cathedral dives to coincide with optimal lighting conditions.