I'm not sure exactly who Nyad is without more context, but since it's based on a true story, she's likely a real person who has had some kind of remarkable experience or journey.
Sure is. 'Nyad' is a true-story adaptation that showcases real-life incidents and emotions. It brings to life the authenticity of a particular situation or person's journey.
It's likely about a person named Nyad and the real - life events related to her. Maybe it could be about her achievements, her journey, or some significant experiences in her life.