Silfra Fissure
Iceland – Þingvellir, Iceland
Glacial meltwater between two tectonic plates, with visibility that can pass 100 m.
- Open Water
- Fissure
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36 dive sites
Iceland – Þingvellir, Iceland
Glacial meltwater between two tectonic plates, with visibility that can pass 100 m.

Bonne Terre Mine, United States
Guided trail dives in a flooded mine lit by over 500,000 watts, in constant 58°F water with about 100-foot visibility.
Coron, Philippines
A lake where fresh water sits on top of salt water heated by geothermal vents to 38 C, with a resident barracuda.
Florida Springs, United States
An underground spring inside a dry cave, with stalactite rock formations and Pleistocene fossil beds, at 72 °F year round.
Hemmoor Chalk Lake, Germany
A flooded chalk quarry to 60 m with an old access road, flooded houses and forest, plus a sailboat at 14 m and a plane at 12 m.
Lake Kaindy, Kazakhstan
Trunks of submerged Schrenk's spruce stand in a 2,000 m alpine lake dammed by a landslide from the 1911 Kebin earthquake.
Lake Tignes, France
Guided dives under 1-2 m of ice on the natural lake of Tignes, where trout overwinter beneath the frozen surface.
Florida Springs, United States
A 70-ft first-magnitude spring with the remains of the Civil War steamboat Madison, scuttled in 1863, in its shallow run.
Iceland – Þingvellir, Iceland
Spring
down to 10 m
Lago di Capo d'Acqua, Italy
Two submerged mills, one still largely intact with its mill wheel visible on the other, lie in about 9 m of clear spring water.
Cavern
down to 18 m
Florida Springs, United States
An open-water basin to 40 ft, a wide-entrance upper cavern and an air bell with viewing windows, plus Virgil the resident turtle.
Lake
down to 18 m
Utah inland dives (Bonneville Seabase & Homestead Crater), United States
A geothermal pond about 16 mi south of Wendover, 18 m deep with warm-water fish such as bass, tilapia and bluegill.
Cavern
down to 15 m
Florida Springs, United States
Pull up to the Ballroom's welded grate at 50 ft and feel the force of 35 million gallons of spring water a day.
Wreck
down to 40 m
Sundhäuser See, Germany
An artificial underwater village at about 10 m with church, graveyard and gallows, plus a fishing-boat wreck at 21 m in the same lake.
Spring
down to 20 m
Okinawa & Yonaguni, Japan
Warm thermal water gushes from a seabed spring off Taketomi, letting divers see a submarine geyser up close.
Spring
down to 20 m
Utah inland dives (Bonneville Seabase & Homestead Crater), United States
A geothermal spring where dives reach about 65 feet in water that stays between 90 and 96°F in every season.
Wreck
down to 37 m
Tobermory (Fathom Five), Canada
An 1853 three-masted barque that sank in 1884 and now rests upright at about 32 m.
Wreck
down to 9 m
Narvik & Lofoten, Norway
A Second World War Junkers 52 plane lying quite intact at 2–9 m in Hartvikvannet, about 3 miles from Narvik.
Wreck
down to 31 m
Tobermory (Fathom Five), Canada
A wreck purpose-sunk upright in 1999 for diving, with the top of the wheelhouse at about 14 m.
Lake
down to 14 m
Rummu Quarry, Estonia
Shallow freshwater quarry dive past flooded prison buildings and a submerged 'Zombie Forest' of drowned trees.
Cavern
down to 6 m
Tobermory (Fathom Five), Canada
A 6 m swim-through along white boulders that opens into a sheltered grotto in the Bruce Peninsula shoreline.
Wreck
down to 13 m
Tobermory (Fathom Five), Canada
Four small steam-tug wrecks in up to 13 m, a popular site for open water check-outs.
Flooded mine
down to 30 m
Conception Bay & Bell Island (Newfoundland), Canada
Flooded iron mine under Bell Island: follow pipe-works and pumps left in the workings that fed Allied WWII shipbuilding.
Lake
down to 23 m
Tobermory (Fathom Five), Canada
A wall dive down the submerged Niagara Escarpment to 23 m at Big Tub Lighthouse Point.