Cape Kri holds a Guinness World Record for the most fish species counted on a single dive — 374 species in one hour. This submerged point on Kri Island in Raja Ampat is exposed to open-ocean currents that deliver an almost overwhelming concentration of marine life, from metre-long bumphead parrotfish to pygmy seahorses. The dive is typically done as a drift from 5 to 28 m along the reef crest.
The Great Blue Hole is a 300 m wide, 125 m deep submarine sinkhole at the centre of Lighthouse Reef Atoll, declared a UNESCO World Heritage Site and made famous by Jacques Cousteau. Divers descend through the hole's cobalt-blue water to 40 m to see perfectly preserved stalactites formed when the cavern was above sea level during the last ice age. Bull sharks, Caribbean reef sharks, and midnight parrotfish cruise the outer walls.
Also known as Fish Head, Maaya Thila in the Ari Atoll is a submerged pinnacle that rises steeply from depth and acts as a magnet for grey reef sharks, white-tip reef sharks, and large Napoleon wrasse. Night dives here are particularly spectacular when nurse sharks and octopus come out to hunt. The strong currents that make this an advanced site are also responsible for its exceptional fish density.
The SMS Brummer is widely regarded as Scapa Flow's most photogenic wreck — a WWI German minelaying cruiser sitting upright and remarkably intact at 36 m. Its guns, torpedo tubes, and encrusted superstructure provide an extraordinary window into naval history, with excellent visibility common at this site.
The SS Justicia is one of the most impressive wreck dives in British waters — a 32,000-tonne Holland America Line troop ship torpedoed by a German U-boat in 1918 and now lying at 68 m off Malin Head. The enormous size of this wreck — stretching over 200 m — means multiple dives are needed to explore it, and the depth demands advanced technical diving skills and equipment.
Sunk by German bombers in 1941 while carrying war supplies, the SS Thistlegorm is one of the most historically fascinating and dived wrecks on the planet. Its holds still contain motorcycles, trucks, rifles, and railway wagons, offering a remarkable time-capsule experience at 16–30 m. Strong current is common on the site so drift planning is essential.
The SS Yongala is widely regarded as one of the world's greatest wreck dives. This passenger steamer sank in a cyclone in 1911 and now rests at 14–30 m, completely encrusted with corals and teeming with giant grouper, bull sharks, sea snakes, and manta rays. Strong currents keep the site nutrient-rich and visibility high, but they also demand experience.
The USS Liberty is a US Army cargo ship torpedoed in 1942 and now resting just metres off Tulamben village beach on Bali's northeast coast. Its accessibility — the bow sits at just 5 m and the stern at 30 m — combined with extraordinary marine life including bumphead parrotfish schools at dawn, make it one of the world's most dived wrecks. Night dives reveal sleeping turtles and hunting cuttlefish.
The Baron Gautsch was an Austro-Hungarian passenger ferry that struck a naval minefield in 1914 and sank with the loss of over 250 lives, making it Croatia's most tragic maritime disaster. The 85 m wreck lies in 28–42 m off Rovinj in the northern Adriatic, largely intact with portholes, anchors, and crockery still visible inside. She is home to enormous conger eels, lobsters, and one of the Adriatic's best grouper populations.
Batu Bolong — 'hollow rock' in Bahasa Indonesia — is a small rocky island surrounded by a reef pinnacle so rich with life that it has been called the Komodo region's greatest dive. The walls from 0 to 40 m are completely covered in sea fans, black coral, and soft corals in orange and purple, while the water column above teems with fusiliers, jacks, and hunting reef sharks. Strong unpredictable currents demand experience and a confident drift technique.
Bloody Bay Wall on Little Cayman is one of the Caribbean's most spectacular wall dives, dropping vertically from just 6 m depth to over 1800 m in the Cayman Trench. The wall face is densely covered with black coral trees, sea fans, tube sponges, and barrel sponges, while eagle rays and Nassau grouper cruise the blue water alongside. Crystal-clear visibility averaging 40 m makes this a benchmark for tropical wall diving.
The Blue Hole at Dwejra on Gozo island is a natural cylindrical hole in the limestone shelf, 10 m in diameter and 15 m deep, that opens through an arch at 8 m into the open Mediterranean. The arch drops to 25 m on the seaward side, connecting to the Azure Window collapse site and a dramatic wall leading to 50 m. The resident date mussels, dusky grouper, and dense moray eel population make it an outstanding Mediterranean dive.
Chumphon Pinnacle is Koh Tao's most celebrated dive site — a cluster of granite pinnacles rising from 36 m to about 14 m with a resident school of massive chevron barracuda, whale sharks in season, and large grouper. Strong currents keep the water clear and the marine life dense, so advanced buoyancy skills are essential. It is accessible only by boat and sits about 13 km from Koh Tao's west coast.
Cirkewwa at Malta's northern tip is an excellent all-conditions training and recreational site built around the wreck of the P29 patrol boat, sunk in 2007, and an older car ferry resting at 18 m. Horse-shoe and arch formations in the limestone provide sheltered habitat for nudibranchs, cuttlefish, and octopus that are among the most photogenic in the Mediterranean. Calm water and easy shore access make it the most dived site on the island.
East of Eden on Similan Island No. 8 is considered one of the most beautiful coral gardens in all of Thailand, with fields of hard corals at 10–22 m harbouring an astounding density of reef fish in dazzling colour. The east-facing aspect means current-driven nutrients fuel constant fish activity, including schooling anthias, neon fusiliers, and resident Napoleon wrasse. Visibility regularly exceeds 25 m during the prime season.
First Cathedral off Lanai island is a dramatic lava tube and cavern system whose domed main chamber is pierced by shafts of light filtering through holes in the rock ceiling, creating a cathedral-like atmosphere at 16 m. Spinner dolphins rest in the calm water near the entrance, and the surrounding reef hosts monk seals, eagle rays, and the endemic Hawaiian cleaner wrasse. The site was extensively surveyed by Dr. Sylvia Earle and remains one of Hawaii's most celebrated dives.
The Hilma Hooker is a 71 m cargo vessel that sank in 1984 under mysterious circumstances (large quantities of marijuana were later found in a hidden compartment) and now rests on its starboard side between 18 and 30 m off Bonaire's west coast. The wreck is an exceptionally accessible and photogenic site surrounded by healthy coral gardens and resident turtles, free-swimming moray eels, and schools of grunt. It requires only a short swim from a shore entry.
Jabuka (the Apple) is a remote volcanic island rising from the deep central Adriatic, and its underwater pinnacle drops from the surface to over 100 m in intensely blue water. Dense colonies of yellow and orange gorgonians cover the upper 40 m of the pinnacle and are home to sea horses, blennies, and spawning Atlantic bluefin tuna passing the island in spring. The site requires a liveaboard or long boat transfer from Split and demands solid open-water skills.
The USS Kittiwake was a US Navy submarine rescue vessel purposely sunk in 2011 off Seven Mile Beach, Grand Cayman, to create an artificial reef. The 76 m vessel lies on its side in 18–30 m and is already coated in encrusting corals, with resident turtles, snapper, and lion fish in every compartment. Multiple levels and penetration opportunities through engine rooms, decompression chambers, and berthing quarters make it ideal for training dives.
The uninhabited islet of Klein Bonaire sits just a kilometre offshore and its protected waters offer some of the Caribbean's most pristine reef diving. No Name is one of the top sites, with a sloping reef from 5 to 25 m packed with healthy stony corals, sea plumes, and brain corals in near-perfect condition. Sea turtles are almost guaranteed, and the lack of strong current makes it ideal for photography and relaxed exploration.
Palancar Reef stretches for more than 5 km along Cozumel's southwestern coast and is widely regarded as one of the finest reef systems in the entire Caribbean, recognised as a UNESCO Biosphere Reserve. Palancar Caves is the most spectacular section, featuring a canyon of huge coral pinnacles and swim-throughs at 10–40 m that shelter black grouper, loggerhead turtles, and queen angelfish. The gentle drift current makes navigation effortless and visibility often exceeds 40 m.
The SS Mohegan was a 3200-tonne Atlantic Transport Line steamer that struck the Manacles Reef in 1898, killing 106 passengers and crew. Her boilers and substantial sections of hull lie at 13–26 m and have become a living reef colonised by soft corals, anemones, and cuckoo wrasse. Grey seals frequent the site and are curious about divers, often swimming circles around them. The Mohegan is one of Cornwall's most atmospherically charged dives.
The SS Persier is a Belgian cargo ship sunk in Plymouth Sound in 1918, lying at 28 m and offering an accessible and rewarding wreck dive within the sheltered Sound. The wreck is home to large conger eels, bib, and well-established crustacean populations on the intact boilers and engine room section.
The SS Wallachia is a 19th-century cargo steamship resting in Loch Linnhe near Fort William at 30 m, one of Scotland's most picturesque loch-based wreck dives with dramatic mountain scenery above. The wreck's iron hull is draped in plumose anemones and hydroids, and large shoals of saithe swirl around the propeller shafts.
Sail Rock is a dramatic vertical granite pinnacle rising from 40 m to 10 m above the sea surface between Koh Tao and Koh Phangan, famous for its vertical chimney running through the rock and predictable whale shark sightings from January to May. Enormous schools of fusiliers and jacks circle the pinnacle while bull sharks patrol the depths. It offers perhaps the best single-dive experience in the Gulf of Thailand.
Santa Rosa Wall is Cozumel's most thrilling drift dive — an almost vertical wall beginning at 7 m that plunges past 40 m with massive purple sea fans and tube sponges projecting into the blue. The incessant current keeps the water crystal clear and nutrient-rich, and the resident hawksbill turtles are so used to divers that they simply carry on grazing the sponge-covered wall. Eagle rays and black tip sharks appear regularly in the open water off the wall.
Sardine Reef off Gam Island is famous for its enormous shoals of silversides that form a living silvery tornado around the coral bommies at 8–20 m. Trevally, giant barracuda, and black-tip reef sharks can often be seen hunting through the bait balls in an electrifying display of open-water predation. The shallow top of the reef at 8 m makes it accessible to most divers.
Smitswinkel Bay in southern False Bay holds five deliberately scuttled vessels — including the SAS Pietermaritzburg, SAS Transvaal, and SAS Pretoria — sunk in 1990 to create an artificial reef that is now one of the most accessible multi-wreck dive sites in South Africa. Lying at 18–35 m, the wrecks are draped in colourful encrusting sponges and house klipfish, Cape knifejaw, and large resident octopuses. Shore entry is possible from the beach and conditions are generally sheltered, making this suitable for divers of all levels.
Two-Mile Reef at Sodwana Bay is the most dived site on South Africa's iSimangaliso Wetland Park coastline, offering spectacular hard and soft coral gardens just two kilometres offshore. Loggerhead and leatherback turtles are resident year-round, and the warm Mozambique Channel current (24–28 °C) sustains an extraordinary diversity of reef fish rivalling any Indo-Pacific destination. Coelacanths have been photographed in the deep submarine canyons directly behind the reef, making this one of the most biodiverse nearshore dives in Africa.
Southwest Pinnacle is a series of large granite pinnacles at 18–33 m depth that collectively form Koh Tao's second most famous dive. Giant grouper, juvenile whale sharks, and sea turtles are regulars, and the overhangs at 18 m shelter impressive soft coral gardens. Current can be strong and unpredictable, so this is recommended for divers with 20 or more dives.
The Elbow at the southern tip of Turneffe Atoll is famous as one of Belize's best current dives, where tidal flow funnels past the reef tip carrying a constant stream of horse-eye jacks, creole wrasse, and spotted eagle rays. Nurse sharks rest on sandy ledges at 20 m and great hammerheads are reliably sighted here in late winter. The drift is exhilarating on a strong tide and very manageable on neap tides.
The Um El Faroud is a 110 m Libyan oil tanker sunk deliberately in 1998 as an artificial reef off Dallamara on Malta's south coast. The wreck lies on a 25–36 m sandy bottom with its superstructure accessible from 18 m, and is now colonised by large Mediterranean grouper, barracuda, and enormous spider crabs. Penetration of the engine room and cargo holds is possible for trained divers and the prop shaft makes for an iconic photographic subject.
Duboka Luka (Deep Bay) on the island of Vis in central Dalmatia is one of Croatia's most celebrated advanced dives, with a large WWII German cargo vessel lying in 35–52 m. The wreck is intact, heavily colonised by gorgonian sea fans and soft corals, and inhabited by conger eels and large dusky grouper. Vis is only recently reopened to tourism and the marine reserve status of much of the surrounding coast means fish life is exceptionally dense.
White Rock is Koh Tao's most popular training and recreational site, consisting of two large submerged granite pinnacles connected by a sandy gully at around 14 m. The site is ideal for Open Water students and night dives alike, with lion fish, moray eels, blue-spotted rays, and frequently visiting hawksbill turtles. Minimal current and good visibility year-round make it a mainstay for local dive schools.