In 1952 Florence Chadwick attempted to swim 26 miles from the coast of California to Catalina Island. After 15 hours, a heavy fog began to block her view, she became disoriented, and she gave up. To her chagrin, Chadwick learned that she had quit just 1 mile short of her destination.

Two months later Chadwick tried a second time to swim to Catalina Island from the coast. Again a thick fog settled in, but this time she reached her destination, becoming the first woman to swim the Catalina Channel. Chadwick said she kept an image of the shoreline in her mind…