Video: Silfra Fissure – Iceland
The Silfra fissure is located in the Pingvellir National Park, Iceland. It was formed due to the drifting of the tectonic plates (Eurasian plate and the North American Plate). The plates drift about 2 cms apart each year, because of which there is tension buildup, and this tension is relieved in the form of earthquakes. The Silfra dive site offers clear waters (visibility greater than 50 metres), and the water is drinkable! Water temperature just above freezing (around 1 to 2 degree celsius). An important thing to note is that a valid diving license is required for diving at this site. A PADI open water license or an equivalent SSI certification is required. Dry suit diving experience is recommended but not mandatory.
Source: Mayur Srivatsav