A helicopter has crashed at Hardy Reef Pontoon in the Whitsundays in North Queensland.
Five people are believed to have been on board.
The Queensland Ambulance Service (QAS) sent a chopper to the pontoon to treat two people believed to have been injured.
QAS said they received a call about the accident at 4:15pm.
The crash site is about 65 kilometres north-east of the Whitsundays.
The police boat Damien Leeding and other vessels are still en route to the site.