Cathedral Cave

Cathedral Cave is a flooded limestone cavern on the northern coast of Tongatapu, widely regarded as one of the finest cavern dives in the central Pacific. The entry at 6 metres leads into a vast chamber roughly 40 metres long and 15 metres wide, where vertical shafts in the ceiling allow sunlight to penetrate in shifting columns, creating the cathedral effect that gives the site its name. The cavern floor sits at 18 metres and is carpeted with rubble, invertebrates, and the occasional resting nurse shark. The dive stays within the cavern's light zone throughout and does not require overhead environment training, though experience with buoyancy control and low-silting technique is strongly recommended. A small resident population of glassfish hangs in the light shafts and attracts trevally and snapper.

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