Trou aux Biches Diving — Mauritius

Trou aux Biches is Mauritius' most popular dive coast, where warm lagoon water gives way to outer reef walls dropping into deep blue. The Cathedral — a stunning cave dive with shafts of light — is the signature site. Luxury resort infrastructure and the famous 'underwater waterfall' illusion from the air make this a complete destination.

Score
65.7 / 100
Country
Mauritius
Region
Indian Ocean
Area
Pamplemousses District
Nearest airport
Sir Seewoosagur Ramgoolam (MRU)
Visibility
10–25 m
Water temperature
22–28 °C
Max depth
35 m
Current strength
mild
Dive types
reef, wall, wreck, drift
Best months
October, November, December, January, February, March, April
Minimum certification
Open Water
Access type
boat
Average 2-tank dive cost
$90 USD
Budget tier
mid range
Key species
dolphin, moray eel, lionfish, hawksbill turtle, clownfish
Google rating
4.5 (260 reviews)
Top operators
Blue Water Diving Center, Dive Dream Mauritius
Nearest hyperbaric chamber
SSRN Hospital Hyperbaric Unit, Pamplemousses (~30 km)
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World Class
Beginner Friendly
Trou aux Biches
MauritiusIndian Ocean
65.7

SCORE

-20.0300°N

57.5500°E

Trou aux Biches is Mauritius' most popular dive coast, where warm lagoon water gives way to outer reef walls dropping into deep blue. The Cathedral — a stunning cave dive with shafts of light — is the signature site. Luxury resort infrastructure and the famous 'underwater waterfall' illusion from the air make this a complete destination.

Mauritius' Premier Dive Coast

Visibility10–25 m
Temperature22–28°C
Max Depth35 m
Currentmild
2-Tank Dive$90
Best MonthsOctober, November, December, January
CertificationOpen WaterBeginner Friendly

Score Breakdown

Click any score to see a detailed breakdown

ML62.0CH52.0VIS60.0SV65.0TMP80.0DA62.0OP75.0TS88.0GT62.0VAL60.0CRD60.0SP62.0

Marine Life

62.0

Species diversity, megafauna encounters, reef fish abundance, macro life, and endemic species.

Species Diversity
58
Megafauna Encounters
52
Reef Fish Abundance
65
Macro Life
55
Endemic Species
55
Marine Life Diversity
62.0
Coral & Reef Health
52.0
Visibility & Conditions
60.0
Dive Site Variety
65.0
Water Temperature
80.0
Depth & Access
62.0
Operator Quality
75.0
Topside Experience
88.0
Getting There
62.0
Value & Cost
60.0
Crowding
60.0
Social Proof
62.0

Key Species

dolphinmoray eellionfishhawksbill turtleclownfish

Dive Types

reefwallwreckdrift

Traveling with Non-Divers?

Your non-diving travel companions will find plenty to enjoy topside while you're underwater. Here are some activities to consider.

Activities for Non-Divers

underwater waterfall helicopter tourPamplemousses Botanical GardenPort Louis marketcatamaran trip to Île aux Cerfs

Nearby Cultural Sites

  • Sir Seewoosagur Ramgoolam Botanical Garden
  • Aapravasi Ghat (UNESCO)

Non-Diver Partner Score

10/10

Excellent for non-divers — they'll love it here.

Family FriendlyYes
Restaurants & Nightlifevibrant

Safety & Emergency

Dive Insurance

Dive insurance is essential. Standard travel insurance often excludes scuba diving. We recommend DAN (Divers Alert Network) for comprehensive dive accident coverage.

Learn More at DAN.org
Hyperbaric Chamber30 km — SSRN Hospital Hyperbaric Unit, Pamplemousses
Nearest Hospital10 km

Chamber at SSRN Hospital; well-serviced tourist area

Skill LevelBeginner Friendly
Current Strengthmild

Top Operators

Blue Water Diving Center

PADI

4.6
200 reviewsNITROX

Dive Dream Mauritius

SSI

4.5
150 reviewsNITROX
Compare This Dive Site
Honest reality check

What your dive shop won't tell you

The minimum certification printed on a brochure is the legal floor, not the honest recommendation. Here's what we actually think you should bring to this site.

Recommended logged dives
45+

Below this we'd send you somewhere easier first.

Recommended certification
Advanced Open Water
“Accessible to most certified divers with basic open water skills.”

What will challenge you

  • →Recreational limit of 40 m is reachable here (max depth 35 m). Gas planning and NDL tracking matter.
  • →Wreck penetration requires Wreck specialty training at minimum, and often decompression planning. Don't improvise inside.
  • →Variable visibility
  • →Deep profiles

What will surprise you

  • →Thermoclines can drop water temp by 6°C between the surface and depth. Your wetsuit choice should match the minimum, not the average.
  • →Trou aux Biches has more marine life variety than most divers expect
  • →Local operators know spots the guidebooks miss
Time of day

When to dive it

Every dive shop gives you this briefing at 7am. We just wrote it down. Tidal dependency: slight. Optimal window: First light to 11am for best visibility..

Morning
  • Viz
    high
  • Current
    mild
  • Crowd
    light
  • reef exploration
  • photography

Best light and calmest conditions before afternoon wind picks up.

Afternoon
  • Viz
    moderate
  • Current
    mild
  • Crowd
    moderate
  • drift diving
  • second tank

Wind chop can reduce viz. Still diveable but morning is better.

Month-by-month

Dive forecast

Realistic conditions by month. Viz ranges are what you should actually expect, not best-case marketing numbers. Confidence % is the share of days that match this profile historically.

Month Viz (m) Temp (°C) CurrentSea RainConfidenceHighlights
Jan18–2525MildCalmLight70%reef fish active, wreck visibility good, peak season crowds
Feb18–2525MildCalmLight70%reef fish active, wreck visibility good, peak season crowds
Mar18–2525MildCalmLight70%reef fish active, wreck visibility good, peak season crowds
Apr18–2525MildCalmLight70%reef fish active, wreck visibility good
May18–2525MildCalmLight70%reef fish active, wreck visibility good
Jun10–1827ModModWet70%reef fish active, wreck visibility good
Jul10–1827ModModWet70%reef fish active, wreck visibility good, manta season
Aug10–1827ModModWet70%reef fish active, wreck visibility good, manta season
Sep10–1827ModModWet70%reef fish active, wreck visibility good, manta season
Oct10–1827ModModWet70%reef fish active, wreck visibility good
Nov18–2525MildCalmLight70%reef fish active, wreck visibility good
Dec18–2525MildCalmLight70%reef fish active, wreck visibility good
Shoot here

Photography brief

Subjects are only half the shot. A perfect macro site is useless in a three-knot drift, and a wide-angle dream is useless at 35 m with a murky ceiling. These are the conditions, not the hype.

Macro subjects70
Wide angle65
Viz stability52
Hover friendliness100
Natural light42

Recommended kit

  • →Dedicated video light for dark wreck interiors; don't rely on strobes alone
Level up here

What this site will teach you

The dives that made you a better diver are the ones that made you uncomfortable for the right reasons. Here's what this site will quietly train you for.

What it costsEstimates — calibration pending

7-day trip, per person

Rough ranges anchored to existing regional data — not booking quotes. Land-based trip, standard breakdown.

Budget
$2,400–$3,500

Hostels, shore diving, cheap eats

Flights (RT from US)
$1,150–$1,450
Accommodation / day
$50–$100
Diving / day
$80–$90
Food / day
$40–$80
Transfers + misc
$50–$150
Mid-range
$3,850–$5,750

3-star hotels, standard boat ops, mix of restaurants

Flights (RT from US)
$1,700–$2,100
Accommodation / day
$120–$220
Diving / day
$90–$120
Food / day
$90–$160
Transfers + misc
$50–$150
Splurge
$6,450–$10,250

Top resorts or liveaboards, premium operators

Flights (RT from US)
$2,500–$3,100
Accommodation / day
$260–$500
Diving / day
$120–$150
Food / day
$180–$350
Transfers + misc
$50–$150

Flights priced round-trip from a major US hub. Figures are per person on a shared room. Solo travelers add ~30% to accommodation.

Pair with

Build a trip around it

Most divers fly across the world for one destination and don't realise another worth-it site is 90 minutes away. Here are the honest pairings.

Best dive types here