After four decades buried in mud and muck, a car was pulled from a creek south of Alcester, South Dakota, Tuesday.
After bringing it to surface, authorities found human bones inside.
They are possibly the remains of Cheryl Miller and Pam Jackson, who were last seen May 29, 1971.
Crews were at the scene at Brule Creek all day, trying to pull the 1960 Studebaker Lark from the ground.
After removing the car, it was lifted with a crane onto a trailer, and put into storage.
Authorities also excavated mud from the surrounding scene and had cadaver dogs search again for human remains.
However, the say most of the bones that were found, were located inside the car before it was moved from the scene.
Those remains were taken to a lab to be identified. Union County Sheriff Dan Limoges said he doesn't know how long that will take.
Limoges wouldn't say whether any other evidence was recovered that would explain how the girls died.
Crews hoped finding the vehicle would help them figure out the truth behind the disappearance of the 17-year olds.
Miller and Jackson were headed to a party at an old gravel pit in a 1960 Studebaker Lark, with the same license plate as recovered from the car in the Brule Creek.
The vehicle was discovered on Monday. Authorities say someone who knew about the case stumbled upon the car, and called authorities.
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