Marina Kazankova is a well known Russian freediver who has set several national records and a world record. According to the video's title this was an attempt to set some sort of Guiness Book of Records title. The quality of the video is low, but I thought you mers might like to see it, because she swims a huge distance on a single breath in her tail.
Also, she was the underwater stunt double for Teresa Palmer in the movie Point Break (2015)
http://www.imdb.com/title/tt2058673/combined
http://www.grindtv.com/surf/the-film...aves-and-more/
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