A daring rescue was made on the Great South Bay after a woman was thrown from a boat Friday.

Firefighters say a woman was found floating on her back without a life jacket around 11:30 p.m.

They say she'd been in the 50-degree water for about a half hour and was suffering from hypothermia when they discovered her.

Islip Fire Department Chief Ronald Pfuhl says, "It was very remarkable we were able to find her while she was laying on her back, she had a small flashlight that she was in control of and was flashing the flashlight. It was really just a lucky night for her."

A group of Islip firefighters and other area departments responded to the call. They were joined Saturday evening by Gina Lieneck, an advocate for boating safety.

Fifteen years ago, she was involved in a boating accident where her daughter tragically died.

"Especially if you are out at night, you should have a life jacket on because anything can happen at any time," Lieneck says.

The fire chief added it is around this time of year they see an uptick in calls involving boaters.