From wikipedia on Susie Maroney who swam Cuba-USA first (with shark cage, and much younger):
<a href="http://en.wikipedia.org/wiki/Susie_Maroney#Achievements" rel="nofollow">http://en.wikipedia.org/wiki/Susie_Maroney#Achievements</a><p><pre><code> Completed 160 km swim from Jamaica to Cuba (15 September 1999).
During Hurricane Floyd, a category 4 hurricane.</code></pre>