Parts of Sea World have been cordoned off after two helicopters collided outside the theme park leaving four people dead, three fighting for their life and others injured.
The Gold Coast-based Sea World took the step to stop park visitors from looking at the crash scene, as traumatised witnesses speak out about what happened.
Witness Emma Burch told Daily Mail Australia how the accident unfolded at about at around 2pm on Monday.
'From what we saw one was taking off, the other landing. They clipped each other,' she said.
'Massive bang heard right through the Broadwater tourist park then the swooshing as the one that lost control hit the water and broke apart.
'It's just awful. Everyone is in shock.'
Sea World Helicopters expressed its sympathy for those involved in the crash and said it is cooperating with the authorities.
A helicopters involved in a crash is seen on a sandbank just outside the Sea World theme park on the Gold Coast
Witnesses expressed their shock at the mid-air collision.
'I heard a bang and saw smoke billowing from one of the choppers. It was smoking and wobbling to the ground,' one said.
'One person was asking whether it was part of the Sea World show.'
Local man Tor Kumpel and his wife were swimming at the nearby Broadwater estuary when he saw the helicopters crash into each other.
'I could see two helicopters. One was coming up and the other one was coming down and the back rotor collected the one coming down,' he said.
Mr Kumpel said the helicopter that was taking off crashed but the helicopter above it managed to land.
'It was only one helicopter that crashed. The one that was coming up. It was horrific to see,' he told the Courier Mail.
'The (pilot) who was in the other one landed that.'
The two helicopters involved in the collision are seen on the sandbank on the Gold Coast in Queensland
A man called John who was on holiday with his wife and toddler son in Gold Coast phoned Melbourne's 3AW radio about the tragic scene.
'I'm at Sea World at the moment and it looks like there has been a massive crash with two helicopters,' he told presenter Heidi Murphy.
'Basically it's all happening here at the moment, ambulances, fire trucks. I was just walking with my son and some Sea World staff were running outside.
'I didn't really know what had happened, but there was a massive bang,' he said.
Marine Rescue raced to the sandbar after two helicopters (pictured) collided on Monday
The two-helicopter crash left four people dead, three fighting for their life and others injured
John told Murphy that Sea World had 'closed that side of the park now so people can't look out the side into the water there. It's pretty scary stuff, actually.'
He said it happened 'just outside the theme park, apparently one was taking off and the other was flying over or something like that ...
'It is literally just outside the theme park, we could hear it on that side.'
John described what he heard as 'a massive, massive bang. It was just huge. I'm not sure if it was the propellors or whatever hitting against each other.'
Rescue workers are pictured at the scene of a helicopter crash over the Broadwater estuary in Gold Coast
The crash between two helicopters (pictured) happened at around 2pm Queensland time
He said he saw a woman 'and her son at the helipad there in tears'. He speculated that she may have had family members on one of the helicopters.
There was no announcement over the park's speaker system about what had happened, he said.
'The theme park is basically running as normal. They've only really blocked that side so no one is looking out over the water, for obvious reasons.
'They're just trying to keep the thing running as normal, I guess.'
A NSW woman saw the crash happening as she queued for the Vortex ride at Sea World.
'My son said there were two helicopters coming at the same time and I'd never seen that but then one turned and hit the other with its tail,' said Amii McDermott from the Blue Mountains west of Sydney.
Police officers are pictured holding up a white sheet to shield a victim of the helicopter crash
Police officers are pictured at the scene of a crash between two helicopters on Monday afternoon
Ms McDermott said she had never seen anything like that before and that she and her family were shocked and horrified.
The 42-year-old emergency dispatcher said there was 'debris everywhere, the tail fell off one of them and the helicopter nosedived into the ground at full-speed'.
She said that though her toddlers don't know what they have seen, her older children do.
Ms McDermott told the Courier Mail she saw the emergency services arrive and heard them calling out for defibrillators.
Investigators are pictured looking at the damage done to one of the two helicopters that crashed
A rescue boat is pictured beside one of the crashed helicopters on Queensland's Gold Coast
Sea World Helicopters expressed its shock and sympathy for those involved in the crash.
'We and the entire flying community are devastated by what has happened and our sincere condolences go to all those involved and especially the loved ones and family of the deceased,' a spokesperson said.
'We are cooperating with all the authorities including the Australian Transport Safety Bureau (ATSB) and the Queensland Police. As it is now a police investigation we cannot provide any further information at this stage.'
The ATSB said it has already begun an investigation into the collision.
'Transport safety investigators with experience in helicopter operations, maintenance and survivability engineering are deploying from the ATSB's Brisbane and Canberra offices and are expected to begin arriving at the accident site from Monday afternoon,' ATSB Chief Commissioner Angus Mitchell said.
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