Dive into Paradise: Seychelles’ Top 5 Scuba Diving Sites (Beyond the Reef!)

Seychelles divides its 81 catalogued dive sites across two fundamentally different worlds. The granite inner islands around Mahé, Praslin, and La Digue offer day-boat access to moderate-depth reefs and pinnacles, while remote outer atolls like Aldabra demand expedition-level logistics and deliver marine encounters on a different scale entirely. Most visiting divers only experience the inner islands — but the sites that push beyond standard reef topography are where Seychelles really sets itself apart.

This article picks five sites that offer something beyond the usual coral reef experience — pinnacle seamounts, granite swim-throughs, drift dives over shark-filled caves, a legendary shipwreck, and a UNESCO atoll that holds the Indian Ocean’s most intact reef system. Each one changes what you expect from a day’s diving in Seychelles.

Heading into open water north of Mahé, the sea floor climbs abruptly.

Brissare Rocks & Shark Bank

Shark Bank rises as a granite seamount from 60 metres to just 18 metres below the surface — a submerged peak that funnels currents and the marine life that rides them. Eight kilometres northwest of Mahé, the site is catalogued as one of the inner islands’ strongest pelagic encounters, earning a spot in the Top 500 dive sites globally. Whale sharks appear here seasonally (concentrating around November, with additional sightings in April and December), while grey reef sharks, large schools of trevally, barracuda, and humphead parrotfish are regulars. The granite plateau is scattered with massive boulders that shelter stingrays and white tip reef sharks. Intermediate divers comfortable with moderate currents will get the most out of this site — the pinnacle format means you’re surrounded by fish on all sides from the moment you drop. For those planning a trip around these waters, book a liveaboard through PADI Travel to combine multiple remote sites in one itinerary.

L’ilot

What do you find inside a granite island barely big enough to walk around? At L’ilot — a tiny granite islet less than half a kilometre from Mahé’s northwest coast — the answer is a network of underwater arches and swim-throughs formed by massive boulders that have tumbled into the sea. The entire circumference of the island can be dived in a single session, with walls covered in soft coral and sponge growth. L’ilot is one of the most accessible sites in Seychelles for whale shark encounters, particularly from September to November when plankton draws them close to shore. Turtles and dolphins are common year-round. Depths reach about 30 metres, and the site suits both beginner and intermediate divers — the swim-throughs are shallow enough that less experienced divers can navigate them comfortably, while more advanced divers can drop deeper along the walls. The marine life here benefits from the same coral superhighway that connects reefs across the archipelago.

South Marianne Island

Of the 17-plus dive sites accessible from Praslin and La Digue, South Marianne Island is widely considered the most impressive — and the most demanding. The site’s topography is unlike anything in the inner islands: a jumble of caves, boulders, and pinnacles that drop to about 25 metres, with strong currents that make drift diving the standard approach. Grey reef sharks are the main draw — they patrol the site in significant numbers — along with eagle rays, hawksbill turtles, guitarfish, and giant moray eels that tuck into the crevices between boulders. This is an advanced site in every sense: the currents require good buoyancy control, and the topography demands awareness of your surroundings. No overnight stays are permitted on the island itself; day boats run from Praslin and La Digue. Given the remote location and strong conditions, dive insurance through DAN is worth arranging before you go.

The Ennerdale Wreck

Northeast of Mahé, at a depth of around 30 metres, lies the Ennerdale — a British Royal Navy fleet oil tanker that sank in 1970 after hitting an uncharted rock and holing its starboard side. The vessel was carrying 40,500 tons of oil at the time; after the spill, it was blown up and now rests in three scattered sections across the sandy bottom. The stern section remains relatively intact, with the wheelhouse and propeller still accessible to divers. Eagle rays and groupers patrol overhead, while the wreck’s steel structure has been colonised by spectacular coral growth over five decades. This is strictly an advanced dive — the depth, potential low visibility, and entanglement hazards from scattered wreckage all demand experience. Aim for the dry season (May to October) when visibility is at its best. Check current travel advisories before planning your trip.

Aldabra Atoll

Aldabra is the largest raised coral atoll in the world, a UNESCO World Heritage Site that sits roughly 400 kilometres from Mahé — a journey that takes several days by sea. Its isolation has preserved one of the Indian Ocean’s most intact reef systems: the atoll’s fringing reefs support marine life at densities the inner islands simply cannot match, with roughly 3,000 fish per 100 square metres. Grey reef sharks, hammerheads, eagle rays, and turtles are common sights on the drop-offs and through the atoll’s channels. Above water, Aldabra hosts the world’s largest population of giant tortoises — more than 150,000 individuals. Diving here requires a liveaboard expedition of 7–10 days, and trips must be pre-approved by the Seychelles Islands Foundation. This is expedition-grade diving: remote, expensive, and unforgettable. To reach Aldabra and other outer atolls, book a liveaboard through PADI Travel — the only practical way to access these sites.

When to Go and How to Dive It

Diving in Seychelles is possible year-round, but the best conditions cluster in two windows: April–May and October–November, when the seas are calmest and visibility peaks at 30 metres or more. Water temperature stays between 26–30°C year-round — a 3 mm wetsuit is all you need.

Whale shark sightings are most reliable around November, with additional encounters in April and December. If big pelagics are your priority, time your trip to these months and focus on outer-reef sites like Shark Bank and L’ilot.

The main choice is between land-based day diving and a liveaboard. Mahé, Praslin, and La Digue all have multiple dive centres — Blue Sea Divers, Big Blue Divers, and Octopus Diving Center are among the established operators — and day boats can reach most inner-island sites in under an hour. A liveaboard is essential for Aldabra and the other outer atolls; operators like the Sea Pearl, Galatea, and Sea Bird run multi-day itineraries that cover several remote sites in a single trip.

Before You Dive in Seychelles

Do I need a certification to dive here?

Open-water certification is required for standard guided dives. Beginners without certification can do supervised introductory programs — PADI Discover Scuba Diving is available at most centres on Mahé, Praslin, and La Digue.

Can I dive Aldabra on a day trip?

No. Aldabra is roughly 400 km from Mahé and requires a liveaboard expedition of 7–10 days. Pre-approval from the Seychelles Islands Foundation is also mandatory — your liveaboard operator typically handles this paperwork.

What’s the best site for a beginner?

Île Cocos and Ave Maria Rocks off Praslin and La Digue are the most beginner-friendly — shallow depths, mild currents, abundant reef fish and turtles. One Tree Island off Mahé is another good option for first-timers, and these sites also make excellent family snorkelling stops.

When is whale shark season?

Whale sharks are most common in November, with additional sightings in April and December. The southeast monsoon (June–August) also attracts plankton that draws whale sharks, but visibility is generally lower during this period.

What’s the liveaboard cost compared to day diving?

Day diving from Mahé or Praslin runs roughly $100–150 per two-tank trip including gear. Liveaboard expeditions to the outer islands start around $2,500–3,500 for a 7-night trip, with Aldabra itineraries at the higher end due to distance and fuel costs.

Seychelles’ dive sites span a wider spectrum than most divers expect — from granite arches you can swim through on a morning boat trip to a UNESCO atoll that requires a week-long expedition. The five sites above represent the best of what lies beyond the reef, and together they show why this archipelago of 115 islands punches well above its size in the Indian Ocean dive scene. For more on Seychelles’ marine life and how to build a trip around it, check out our guide to Seychelles turtle encounters and nesting giants on Cousin Island.

References

U.S. Department of State. “Seychelles Travel Advisory.” 2024. ↗

PADI Travel. “Seychelles Liveaboards.” ↗

Department of Biology, University of Oxford. “A Coral Superhighway in the Indian Ocean.” 2023. ↗

Divers Alert Network. “Join DAN.” ↗

If you’re building a full Seychelles itinerary, you might also enjoy our guides to family-friendly beaches and marine life, eco-adventures in Seychelles, and romantic escapes for couples. Each one offers a different angle on experiencing these islands beyond the dive boat.