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It is the deepest cave in Northern Europe. [26] Cave divers occasionally visit Jordbrugrotta which is the most dived cave in Scandinavia. Most of the other approximately 200 caves in Rana are not suitable for diving, and formation of caves has been limited due most of the rock being granite. Another diveable cave nearby is Litjåga.
The ice formations in the cave were formed by thawing snow which drained into the cave and froze during winter. [4] Since the entrance to the caves is open year-round, chilly winter winds blow into the cave and freeze the snow inside. In summer, a cold wind from inside the cave blows toward the entrance and prevents the formations from melting.
Another kind of snow cave is the quinzhee, which is constructed of piled and packed snow rather than created by digging a hole out of (or displacing) snow. Snow cave excavated in a large snow drift and arranged as a bar in Adélie Land, Antarctica, 1977. A narrow entrance tunnel, a little wider than the occupants of the cave, leads into the ...
A popular cave diving destination, Pluragrotta attracts more divers than any other cave in Scandinavia. Visibility in the cave waters is high. The cave's passages were formed by the flow of the Plura river over limestone, and the cave system includes marble formations. A number of species have been identified in the cave ecosystem.
The cave belongs to the Untersberg massif, at 1570 metres above sea level, and is the only ice cave open in Germany. It has an estimated ice volume of about 60,000 cubic meters and has been run as a show cave since 1925. The explored length of the ice cave is 3,621 meters, of which, 500 meters is a guided tour at temperatures near zero degrees ...
In 1960, it was explored to a depth of 545 m (1,788 ft), which made it, at that time, the fourth-deepest cave in the world. In the subsequent years, the cave was intensively explored and connected with other caves. Exploration in the 1960s bottomed out at a sump or siphon, a U-shaped tunnel filled with water, at a depth of 752 m (2,467 ft).
Porth yr Ogof – the scene of 11 fatalities. The following is a list of the 137 identified recorded fatalities associated with recreational caving in the UK. The main causes of death have been drowning when cave diving, drowning as the result of flooding or negotiating deep water, injuries incurred from falling from a height, and injuries incurred as the result of rock falls.
In 1887, it was the first electrically lit cave in Europe. At about this time 7,171 square metres of the cave's known area of 8,874 square metres were reported covered with ice. The total ice volume was estimated at 125,000 cubic metres, [5] which makes it one of the most important ice caves in the world. The thickness of the ice reaches up to ...