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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.
The new cave, that lay at the altitude of 920 metres (3,020 ft) above sea level, was called Marble (initially, also the name "Afghan" was used), due to the fact it that was formed by marble limestone. [2] In 1988, the center of speleology tourism Onyx-tour established sightseeing tours, concrete paths were laid, and lighting.
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.
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).
Bungee jumping off the Victoria Falls Bridge in Zambia/Zimbabwe Everest base camp is a popular destination for extreme tourism.. Extreme tourism, also often referred to as danger tourism or shock tourism (although these concepts do not appear strictly similar) is a niche in the tourism industry involving travel to dangerous places (mountains, jungles, deserts, caves, canyons, etc.) or ...
This list of deepest caves includes the deepest known natural caves according to maximum surveyed depth as of 2024. The depth value is measured from the highest to the lowest accessible cave point. The depth value is measured from the highest to the lowest accessible cave point.
However, many ice caves exist in temperate climates, due to mechanisms that result in cave temperatures being colder than average surface temperatures where they formed. [7] Ice plates. Cold traps: Certain cave configurations allow seasonal convection to import cold air from the surface in winter, but not warm air in summer. A typical example ...