Cheryl Miller's driver's license was among the evidence collected from the car she and Pamela Jackson were last seen in. The two South Dakota girls disappeared in 1971. Now, authorities say it appears they accidentally drove into a creek. It wasn't until last year that low waters revealed the vehicle. South Dakota Attorney General's office/AP hide caption

itoggle caption South Dakota Attorney General's office/AP

An undated photo provided by the South Dakota Attorney General's Office shows a Studebaker found this week in a creek near Elk Point, S.D. Two teenage girls from the area were last seen May 29, 1971, driving a car like it. Remains found in the vehicle may be those of the two teenagers. AP hide caption

itoggle caption AP

The two cars recovered from Foss Lake in western Oklahoma. Bodies were found inside both. The discoveries may help solve the mysteries of what happened to people who went missing decades ago. Laura Eastes/Daily Elk Citian/AP hide caption

itoggle caption Laura Eastes/Daily Elk Citian/AP