To get the shot Mr Karbus, 33, his girlfriend and a friend ventured out from the shore, cut a hole in the 30 centimetre thick ice and took the plunge:

http://www.dailymail.co.uk/news/article-2204942/The-Northern-Lights-seen--captured-ice-freezing-waters-Arctic-Circle.html

More in the Reddit thread:

http://www.reddit.com/r/pics/comments/1jmp8z/free_diving_in_the_white_sea_with_the_northern/

free diving under ice seems like a horrible idea. Beautiful though...