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.
Definitely true. Diana Nyad's story is based on real events and her actual endeavors. Her perseverance and determination are inspiring and have been widely reported.
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.