

Best for intermediate divers, 20-30m, boat entry, moderate current.
The Tunnel in Blue Bay is a boat-access site featuring a combination of reef, wall, and cave topography. Divers navigate a wall that drops to 30 metres, alongside a cave swim-through that requires solid buoyancy control. Conditions include moderate currents and visibility ranging from 15 to 50 metres. Due to the overhead environment, depth, and current, this site is suited for intermediate divers. Divers should monitor depth gauges closely and carry a torch for the cave section. Entry is by boat only, and the typical dive duration is 50 minutes. Hazards include sharp coral, stonefish, sea urchins, and potential for strong currents.
-20.45532, 57.70933
Watch the current direction before entering the cave section as flow can increase significantly inside, and always carry a torch regardless of the excellent ambient visibility outside. Check locally for up-to-date boat operator schedules and current conditions before booking.
Easily accessible by car or taxi from Mahébourg and the airport.
Recorded at this site
Depth
20-30m
Visibility
15-50m
Skill Level
Intermediate
Entry
Boat
Boat required
Water Temp
24-28°C
Current
Moderate
Typical Dive
50 min
No, this site is intended for intermediate divers due to the overhead cave environment, depth, and moderate currents.
The site features a wall dropping to 30 metres, with an average depth of 20 metres.
The Tunnel is a boat-access site; a boat is required to reach the location.
This site is primarily a dive location featuring a cave and wall at depths of 20 to 30 metres, making it unsuitable for snorkelling.
Water temperatures range from 24C in the cooler months of July to October to 28C from January to April.
Diving at The Tunnel in Mahébourg requires the following certifications: Open Water, Advanced, Nitrox. Always dive within your training limits.
A 3mm wetsuit is recommended for diving at The Tunnel in Mahébourg. Water temperatures range from 24°C to 28°C.
Divers at The Tunnel in Mahébourg should be aware of stonefish. These encounters are generally rare and avoidable with proper awareness. Follow local safety guidance and maintain a respectful distance from all marine life.