Alor: Cathedral Dive Site – Alor Archipelago

Site Overview

Cathedral is one of Alor's most spectacular and dramatic dive sites, featuring enormous limestone caverns and swim-through archways that give the site its evocative name. Located along the steep volcanic wall on the western side of the Alor-Pantar strait, the site benefits from powerful tidal currents that deliver a constant supply of nutrients, sustaining extraordinary coral growth across every surface. The main attraction is a series of large caverns at 12 to 20 meters depth, where sunlight filtering through multiple openings in the rock ceiling creates breathtaking shafts of golden light that illuminate dense forests of soft corals and gorgonian sea fans. The walls outside the caverns drop from 5 meters to well beyond 35 meters, covered in vibrant hard and soft corals that support an astonishing density of marine life. Grey reef sharks and whitetip reef sharks patrol the deeper sections, while schools of barracuda, eagle rays, Napoleon wrasse, and bumphead parrotfish are regularly encountered cruising along the wall face. The shallower reef gardens at 5 to 12 meters are a kaleidoscope of color, with dense schools of anthias, fusiliers, and butterflyfish swirling around massive table corals and staghorn formations. Inside the caverns, divers can find resting whitetip sharks, lobsters, moray eels, and a variety of crustaceans sheltering in the dark crevices. The site is best dived during slack tide windows from April through November when visibility reaches 25 to 35 meters and the morning sunlight creates the most spectacular light displays inside the caverns.