Résurgence
Pluragrotta – Plura resurgence pool
Pool and cavern zone (separate line): NGDF guidance [1] (NGDF says divers without cave training may dive the pool or the cavern zone with an experienced cave diver; the cavern zone has its own line.). Ces catégories sont propres au système de certification mentionné ; elles décrivent la formation requise pour le site.
The main diving entrance to Pluragrotta: a pool where the underground Plura river reappears near the farm Jordbru, about 200 m from the Plura Valley dive centre. A lined cavern zone leads into very cold, clear cave passage.
The Plura river resurges in a pool near the farm Jordbru in Plurdalen. A resurgence is a spring where an underground river returns to the surface; divers swim against the outflow into the cave. The pool and the first part of the cave form a cavern zone with its own guideline (a fixed line divers follow so they can find the way out).
An air chamber, called the Chapel by the local dive centre, lies about 450 m inside, and most of the route to it can be seen within roughly 30 m depth, according to NGDF. Deeper side passages and the deep run towards Steinugleflåget are reserved for experienced technical cave divers.
The Plura Valley dive centre sits about 200 m from the entrance with accommodation, a shop and gas fills.
L'environnement
Cold river water from about 1.5 °C in winter to 7 °C in late autumn, usually very clear, in river passages with jumps (side lines) to side passages. Visibility can drop to a few metres during May snowmelt.
Conditions
Seasonal snowmelt in May reduces visibility to 2-3 m; late winter and early spring bring the clearest water (dive centre figures).
Fourchettes indicatives issues de sources publiées, pas les conditions actuelles.
Installations
Dive centre about 200 m from the entrance with accommodation (20 beds), shop, lounge, sauna and gas fills; guided packages include air, oxygen and nitrox, with helium charged separately.
Autres entrées vers Pluragrotta–Steinugleflåget system
Pour s'orienter, pas pour naviguer. Les points creux sont approximatifs.
Chaque information de cette page, avec sa source (10)
| Information | Statut | Source |
|---|---|---|
| The river sinks at the Trollkjærka collapse and resurges in a pool about 200 m from the farm Jordbru; the dive centre is about 200 m from the entrance. | Vérifié | [1] |
| Most of the route to the air chamber, about 450 m in, can be seen within just over 30 m depth.NGDF Norwegian text gives about 450 m; the dive centre places the Chapel air chamber about 450 m into the mountain. | Vérifié | [1] [2] |
| Non-cave-trained divers may dive the pool or the cavern zone, which has its own line, with an experienced cave diver.Association guidance. | Vérifié | [1] |
| Water ranges from about 1.5 °C in winter to 7 °C in late summer and autumn.NGDF gives 3-6 °C. | Signalé | [2] |
| Visibility is about 35 m most of the year, around 100 m in March-April and 2-3 m in May.Provider claim. | Signalé | [2] |
| The police access ban on the Plura caves was lifted on 2014-03-31. | Signalé | [4] |
| Guided packages include air, oxygen and nitrox, rental tanks and accommodation; helium is not included.Provider claim; no prices published. | Signalé | [2] |
| Plura Sleep offers 20 beds year-round next to the cave entrance. | Signalé | [3] |
| Divers without cave training may dive only the pool or the cavern zone, accompanied by an experienced cave diver.NGDF guidance, not a legal rule. | Vérifié | [1] |
| The Plura Valley dive centre beside the entrance is mapped at about 66.282 N, 14.732 E.From the regional tourism listing; area precision because the entrance is about 200 m from the centre. | Vérifié | [3] |
Vérifié : indiqué par une source officielle ou primaire que nous avons consultée. Signalé : issu d'une source secondaire uniquement. Sources contradictoires : la note présente les deux versions. Peut être obsolète : la source la plus récente que nous avons trouvée est ancienne.
Rédigé dans nos propres mots à partir des sources ci-dessus. Signaler une correction