There's been a second shark attack in less than twenty-four hours at The Whitsundays region in North Queensland.
The rescue chopper is responding to the incident.
The attack comes are a woman was attacked while snorkelling early last night. Justine Barwick, 46, was snorkelling at Cid Harbour on Wednesday evening when the attack happened leaving her with a severe wound to her left thigh and minor wounds to her calf.
Ms Barwick, a mother of two, would likely have bled to death without the quick-thinking actions of people in nearby boats.