CNN 's CNN speaks with British round - the - world sailor Dee Wallace . She is the only woman to have sailed around the world in both directions . Caffari spent 99 days at sea completely alone and says preparation is the key to success in long-distance voyages at sea . Lack of sleep and hunger are the main challenges , according to Caffari . Desire , preparation and self - control are the keys to success , Caffari says .
CNN 's CNN speaks with British round - the - world sailor Dee Wallace . She is the only woman to have sailed around the world in both directions . Lack of sleep and hunger are the main challenges , according to Caffari . Desire , preparation and self - control are the keys to success , Caffari says .