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Speilsalen (The Hall of Mirrors) was a natural glacial formation caused by a river underneath a glacier in the Trollheimen mountains in the municipality of Oppdal in Sør-Trøndelag county, Norway. It was located at the northeast base of the mountain Blåhøa.
Map of Speilsalen, 7340 Oppdal, Norway
Under favourable conditions late summer, it was possible to walk the 200 to 300 metres (660 to 980 ft) from one end to the other underneath the glacier. It was never considered safe to walk under a glacier. Speilsalen collapsed in August 2007.
References
Speilsalen Wikipedia(Text) CC BY-SA