By Ed Lavandera, CNN
FOSS, Okla. - Forensic investigators are combing through a trove of evidence, discovered by accident this week in a lake in western Oklahoma. Confirming the identities of the bodies and how they got there will be no easy task.
A picture shows Jimmy Williams standing next to his bright blue 1969 Camaro, bought six days before he disappeared. A sweet-driving, muscle car that would be the envy of any teenage boy.
Oklahoma investigators believe that car is now a corroded jelly-like carcass found sitting at the bottom of Foss Lake in western Oklahoma. It was one of two cars found there this week, containing the remains of six bodies.
When Williams and two other teenage friends disappeared in 1970, his family spread "missing posters" all over their hometown of Sayre, Okla., offering a $500 reward.
The teenagers were believed to either be on their way to a football game or on a hunting expedition, no one really knows, but CNN did see investigators uncover two corroded rifles from the car.
Investigators say they have not ruled out foul play yet, but they suspect these six victims accidentally drowned, that the cars rolled back into the water, and they accidentally drowned.
The cars were discovered by a team of divers with the Oklahoma Highway Patrol. Darrell Splawn and his colleagues were testing new sonar equipment.
It wasn't until the cars were pulled out of the water that the gruesome and mysterious discovery was made.
"It could have been a shoe, but whenever we brought them up to the shore, that was when the door was opened and you could see the skeletal remains in them," said Splawn.
John Alva Porter is believed to be one of the victims in the second car. He and two friends were last seen driving a 1950s Chevy when they disappeared in 1969, a year before the teenagers went missing
His granddaughter, Debbie McManaman, says her family used to look out onto this water and wonder.
"We'd always say, 'Maybe grandpa is in the lake, maybe he had an accident, and maybe he's in the lake,'" said McManaman.
Reporter: "You used to say that?"
"Yeah even since I've been married and an adult we would come up here and say maybe grandpa is in the lake you know maybe that's where he's at?" said McManaman.
A random thought that may turn out to be oddly prophetic.