18-28m
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    Flic en Flac & West Coast, Mauritius
    Black River Fishing Reserve

    Cathedral

    Best months: Nov–Feb

    Protected Area

    Black River Fishing Reserve

    Why dive here

    With 434+ marine species recorded in the area - including barracuda, blue sharks, dolphins, dwarf minke whales and great white sharks - Cathedral offers some of Flic en Flac & West Coast's richest cave diving. Water ranges 25-29°C, warmest February, March, April.

    Best timeNov–Feb
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Blue Sharks, Dolphins, Dwarf Minke Whales and Great White Sharks · 434+ species recorded
    Water25-29°C · warmest February, March, April
    CharacterCave dive · max 18-28m
    StandoutExceptional marine biodiversity

    Cathedral is one of those sites we always make time for when we're in Mauritius. Dropping down to 28 meters, it’s certainly an advanced dive, but the reward is substantial. You’re not here for vast coral gardens; this spot is all about the structure, a dramatic volcanic rock cavern. When the conditions are right, usually around mid-morning, the light shafts punching through the roof are incredible, almost tangible in the water. It's a genuinely atmospheric dive, the kind that makes you feel tiny and utterly immersed. Inside, we often find ourselves drifting slowly, letting our eyes adjust to the dim light. Look for the quieter residents like the Longnose Hawkfish perched on sea fans, or the shy Mimic Blennies tucked into crevices. Out in the open, schools of Glasseye Snappers often hover, their eyes like marbles catching the diffused light. We've even been lucky enough to spot a Blue Marlin on the outer reef wall a couple of times, a real heart-stopper. It’s not a drift dive, so you can really take your time exploring the nooks and crannies. This dive is perfect for photographers chasing those iconic light beam shots or anyone who appreciates dramatic underwater topography.

    Typical Cathedral Dive Profile

    10m20mSafety Stop0m18m max~50 min estimated bottom time

    Illustrative profile based on site depth and type. Actual dive profiles vary - always follow your dive computer and training.

    Safety Notes

    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.

    Today05:4418:1212h 28m daylightGolden hour 17:43

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    Conditions

    Ocean conditions, forecast and tides for Cathedral

    Cathedral Ocean Conditions

    Monthly averages for Cathedral, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (-20.25, 57.38) (7km away)

    ExcellentGreatGoodFairPoor★Best monthsThis month

    October Averages

    Sea Temperature

    25°C

    77°F · Range: 24.2–27.5°C

    Air Temperature

    24°C

    76°F

    Wind Speed

    7.13 m/s

    13.9 knots

    Atmospheric Pressure

    1017.9 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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