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Caverns and lava tunnels of Mauritius and Réunion

La Cathédrale (Flic en Flac)

  • Max depth30 m
  • CertificationCavern
  • Water temperature≈ 22–28 °C, varies with the seasonestimated, no reports yet

The dive

Between rocks and drop-offs you swim into a large hall where daylight falls through arches and openings like through church windows, which gives the site its name.

A dive to 30 m with the cave entrance deep on the site: per the sources only for advanced and experienced divers. Dive it with a guide who knows it.
Profile and sections

Between rocks and drop-offs you swim into a large hall where daylight falls through arches and openings like through church windows, which gives the site its name. Gorgonians and black coral grow under the vault, and many fish swim and shelter in its passages. There are caves, arches and a chimney.

SeaUrchin Diving Center calls it the most famous dive site in Mauritius.

Practical: the site is about five minutes by boat from the port of Flic en Flac and can be dived all year, in water of 22–28 °C.

Depth and profile
Plan for 30 m: Le Figaro Nautisme (2015) puts the cave entrance at 30 m. Per dive.site and Edelweiss the dive starts around 18 m and goes to nearly 30 m; SeaUrchin gives 28 m.
Configuration
A daylit cavern, guided: recreational gear with a torch (estimate).
Who can dive where
  • CaveAt least Cavern
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 30 m (trimix or deco may be needed) · doesn't decide who may dive
Through a dive centre or guide

This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.

How to get there

By boat, about five minutes from the port of Flic en Flac on the west coast, outside the reef. Dive centres in Flic en Flac guide here, such as SeaUrchin Diving Center.

Plan your route ↗

Around La Cathédrale (Flic en Flac)

FillsNo fill station known nearby
Other sites2

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Sources, sharing and disclaimer

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Oct 2026): dive centres' site pages in SSI's dive guide (SeaUrchin Diving Center, Scubananas), dive.site, the activity pages of Plongée Salée and Scuba World Diving and the article on Réunion's best dive spots on manawa.com, the PADI blog on the top ten dive sites of Mauritius (updated Sep 2026), Le Figaro Nautisme (2015 and Nov 2025), the INPN's ZNIEFF sheets on Les grottes du Portail (2020), Mauritius's official tourism site, the ARS La Réunion list of hyperbaric chambers (Apr 2023), the Réunion marine reserve's leaflet and an e-mail from its management (GIP Réserve Naturelle Nationale Marine de La Réunion, Nov 2026) and a prefecture draft order on shark sightings. These are caverns, reef caves and basalt tunnels with daylight, all boat dives with a dive centre. No source gives coordinates. Certification and configurations are estimates.