A monster 6ft shark ripped a massive chunk out of a diving instructor's arm during a terrifying attack.
Zack Winegardner, 26, was spearfishing off the coast of Marathon, Florida, US, on September 6 when a 6ft-long bull shark "appeared out of nowhere" behind him and sunk its razor-sharp teeth into his right arm.
After realising he'd been bitten, Zack ascended 75ft to the surface and made his way back to shore before he was airlifted to Jackson South Medical Centre in Miami.