When Bethany Hamilton was only 13 years of age, she was attacked by a 15-foot tiger shark.

The event cost the young Hawaiian surfer her left arm, but not her soul, inner strength, and competitive drive.

More than a decade later, Hamilton became a mother and started surfing big waves. She proudly "surfs like a girl."

"Bethany Hamilton: Unstoppable" is a biographical documentary about a woman that, through resilience, love, and faith, became one of the most influential surfers and sportswomen of the modern world.

Directed by Aaron Lieber.