Image copyright Reuters A man leapt from his surfboard on to a shark that was attacking his wife, repeatedly punching the animal until it let go, Australian media report.
Chantelle Doyle, 35, was surfing off Shelly Beach at Port Macquarie, New South Wales, when the attack took place.
Her husband punched the shark until it released its grip and then helped Ms Doyle to the shore.
She was airlifted to hospital with serious