Gruesome details emerge after teen girl suffers ‘devastating’ shark attack as experts warn swimmers should be on alert

HORRIFYING details have emerged after a teen girl suffered devastating wounds from a shark attack off the US coast.

Addison Bethea, 17, was hunting for scallops off the northwestern coast of Florida when an unidentified shark latched onto her leg Thursday.

Her firefighter brother helped to fend off the predator and provide medical assistance to the severely maimed victim who faces a tough road of recovery.

A Perry native, Bethea traveled to Tallahassee and had been scalloping for about two hours the day of the incident.

"We were scalloping for about two hours and we went to the last spot, obviously for only like 15 minutes," Bethea said.

";We were going towards the boat, and I felt like a tug.

Addison said she attempted to punch the shark but failed because of its position.

"Then it tried to drag me underwater because we were in like six feet of water," Addison told .

Her brother, firefighter and emergency medical technician Rhett Willingham, was about eight feet away from Addison when he witnessed the struggle.

"I stood up to turn around and see what was going on because it sounded like something scared her," Willingham said.

"And she was under the water and then she came back up and there was blood around her and I saw the shark."

Willingham bravely swam toward his sister and saved her from the attacking shark.

The species of shark has not been confirmed, but witnesses are estimating the predator was nearly nine feet long.

He then brought her on the boat and helped reduce bleeding in her leg by applying a tourniquet.