The amazing visibility and accessibility makes Silfra a popular diving spot.
The visibility is extraordinary at nearly 100 meters.
The reasons for this outstanding clarity are two-fold.
First, the water is cold - 2o and 4oC and remains at this temperature all year round.
The coldness keeps the water free of aquatic life.
Secondly, the water itself is of the purest form.
This water then disappears and runs underground, to emerge once again in the Thingvellir national park.
This rift marks the actual boundary between the two tectonic plates - the Eurasian and the American.
The lava coalgates instantly and over millions of years this process has formed the Atlantic Ridge.
The high depth and very narrow passages pose high risk for divers.
Besides, the rocks that form the cave could be loose and collapse.
Learn more about Silfra and opportunities for diving atSILFRA.org
