26-year-old Şahika Ercümen from Turkey is the Guinnes world record holder in the longest breath hold swim under ice (wearing fins and diving suit), with a 110 meter swim at Lake Weissensee, Austria, on 11 February 2011, beating both the women’s record of 70 meters and the men’s of 108 meters. Here is a nice video with her I guess sponsored by Turkish Airlines.
There are other nice videos featuring her on the internet, like this one from her own YouTube channel
And others with her successfully attempting to set world records in the ‘variable weight without fins’ and ‘constant weight with fins’ disciplines, now only pending drug test results.
See also www.sahikaercumen.com