The boys began to swim out, with Lucan reaching the youngest girl first and 15-year-old Callum Williams continuing to where the oldest was struggling.
"Everyone was pointing the direction where to go and she was way, way out past the breakwater," said Callum. "So I just kept on going and it took ages to get out there and I was getting really tired."
Daniel Troy, 17, and his brother Kris, 15, helped Lucan bring the young girl into shore.
"She was in a bit of shock and everyone was covering her in towels to keep her warm," said Lucan. "Even walking back in everyone was just struggling to stand because the current was so strong."
As time went on, there was panic on the beach as the girls' family watched in horror and other beachgoers began to step in.
A kayaker, Andrew White, and an unidentified surfer managed to take a lifejacket to the second girl.
Nick Roydhouse, 17 and another boy, Izaiah Lange, 15, helped bring the 16-year-old to shore where she was cared for by onlookers.
When Callum reached the 21-year-old she was coughing up water and struggling to stay afloat, he said.
"I saw her face when I got carried up by a wave and she was going under the water and spewing up water.
"So I put her arm around my shoulder and kept saying 'Breathe, breathe, it's going to be okay, I'm here'."
The pair had to navigate under waves, and were dragged back by the woman's cotton clothes.
"The waves were absolutely smashing us ... I was just trying to talk to her and ask her questions to keep her conscious and just as I was getting into the breakwater this surfboarder came along."
The surfer was helped by the boys to lift the woman on to his board and carry her into shore.
"She was pretty much unconscious," said Lucan.
"Callum could hardly walk either, he was so tired," said Kris.
The girls were taken to hospital and discharged. yesterday afternoon.
Mr Stevenson said the boys' heroics actions prevented a tragedy.
