
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

See more images

A view of the ceiling


Hummocks, or blocks of blue ice that look like precious stones.


Another view of that sunrise
Photographer Andrey Grachev
Source
RELATED
THE FROZEN WATERFALLS OF LAKE SUPERIOR CAVES
The wonder of Apostle Island National Lakeshore caves in Wisconsin
Read more and see photos
http://ottersandsciencenews.blogspot.ca/2014/10/the-frozen-waterfalls-of-lake-superior_17.html
More fascinating articles on caves on this blog
http://ottersandsciencenews.blogspot.ca/search/label/Geology%20-%20Caves
More fascinating articles on caves on this blog
http://ottersandsciencenews.blogspot.ca/search/label/Geology%20-%20Caves
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