Marine engineer Norah Chen designs a groundbreaking deep-sea submersible with her husband, Derek Sterling, only to discover he sabotaged it during their honeymoon dive in an attempt to kill her. Using her expertise, Norah survives and uncovers evidence that sends Derek to prison. After divorcing him, she opens her patent to the public, establishes a fund supporting female marine scientists, and develops a new submersible. Transforming betrayal into purpose, Norah dedicates herself to marine engineering and inspires others to rise from the depths of adversity.