(CNN) An Australian woman has a surveillance camera to thank for her rescue after she got lost while camping with friends.

Deborah Pilgrim, 55, didn't return from a walk Sunday in Sedan, about 60 miles from Adelaide.

Police searched for three days. They used a chopper, drones, volunteers and several other adjacent agencies -- without success.

"We held great fears for her safety," the South Australia Police said in news conference. "That area is quite harsh...very easy to lose your footing.

"Of course, with venomous reptiles around the place, if she had been snake struck, she would have been in all sorts of grief."

Before the fourth day of search and rescue, the police received some information from a man who has property in the area.

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