WATCH: The Diana Nyad Documentary Trailer

More than 30 years ago, champion swimmer Diana Nyad was a national darling. Her journeys -- which included a record-breaking swim around Manhattan and a long-distance trek from the Bahamas to Florida -- garnered her accolades and admiration from the media and public alike. But one goal eluded her.

In 1978, Nyad attempted to become the first person to swim the 103-mile expanse from Havana, Cuba to Key West. However, the 28-year-old athlete's journey was interrupted by turbulent waters, which pushed her off course and forced her to abandon her hopes of completing her mission.

At the age of 60, Nyad, whose last name references the water nymph of Greek myth, resumed training to complete this expedition. Brimming with inspiration, this 96-minute documentary trains its lens on the journey of Nyad -- who overcame sexual abuse as a teenager to become one of America's foremost out athletes -- as she prepares for her 60-hour trek of storms, stings, and shark-infested waters toward the other shore.

Watch the trailer below.