UPDATE: ONE man is dead another has been airlifted to hospital after their helicopter plunged into a creek south of Melbourne.
The chopper, believed to be a gyrocopter, crashed on an inlet between Cannons Creek and Quail Island, about 55km southeast of the Victorian capital just after midday.
One man managed to escape the wreck and was airlifted to hospital with unknown injuries.
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Police this afternoon confirmed a second man, thought to be still trapped inside the submerged aircraft, had died.
PICTURE: Courtesy Christie Cooper (Twitter)