On Sunday night at around 5.50pm, four teenagers were rescued by surf lifesavers after getting in trouble in the water, News.com.au reports.
But the dramatic rescue left police, helicopters and boats frantically searching for the group's missing 17-year-old friend until dark.
"We just heard there were five kids and they rescued four but one was still missing," 17-year-old Tahni Olofsson, who was helping with the search, told The Advertiser.
"They were hysterical. She [missing girl] could be anywhere right now, it’s hard to say when they’d give up the search."
The rescued teens were treated by paramedics and taken to Royal Adelaide Hospital. A 17-year-old girl was in a critical condition and had to be given CPR by paramedics on the way.
This article originally appeared on marie claire.