Image Credit: Sleeperdude / YouTube.Parking a car indoors can preserve it, although few garages provide the kind of accidental time capsule created by a basement in Knoxville, Tennessee. A 1949 Pontiac spent so long down there that the world outside had changed dramatically by the time anyone seriously started bringing it back.The black Silver Streak was apparently parked in 1960, when it was only 11 years old, and remained there for the next 66 years, protected from the weather while decades of personal belongings, paperwork, and everyday debris stayed largely where their owners had left them.Sleeperdude documented the Pontiac's remarkable cleanup on YouTube after previously getting its straight-eight engine running for the first time following its long slumber. They went into the interior expecting deterioration and instead began uncovering pieces of American life that had effectively been sealed away since the Eisenhower era.AdvertisementAdvertisementCleaning the car quickly became almost as much an archaeological dig as an automotive project. Even the Pontiac itself had survived far better than its six decades of neglect would suggest.The Pontiac Still Has Just 40,311 MilesImage Credit: Sleeperdude / YouTube.Service stickers inside the car provided compelling evidence that the odometer's roughly 40,000-mile reading is genuine. Sleeperdude found stickers showing mileage figures in the upper 30,000s during the late 1950s, while the odometer currently reads 40,311 miles.The Pontiac is equipped with a straight-eight engine and an automatic transmission, along with a radio and several wonderfully period accessories. Curb feelers, bumper guards, an exterior sun visor, and wide whitewalls give it the sort of appearance that could hardly be mistaken for anything built in the modern era.Its condition underneath all the grime was equally surprising. Sleeperdude found little of the serious corrosion that might have consumed a car stored outdoors for the same length of time, although evidence suggested the basement itself had experienced moisture.The Glovebox Was A Portal Back To The 1950sWhat remained inside may be even more fascinating than the car, as they uncovered old Lucky Strike cigarettes, Prince Albert tobacco packaging, Dentyne gum, five-cent Baby Ruth and Butterfinger wrappers, wooden matches, and numerous pieces of paperwork.AdvertisementAdvertisementOne particularly interesting discovery was a Knoxville and Knox County Civil Defense evacuation guide explaining what residents should do in the event of a hydrogen-bomb attack. Its instructions included choosing evacuation routes in advance and warned residents about the destructive radius of a nuclear blast.There were old Tennessee inspection stickers as well, including examples dated 1952, 1957, 1959, and 1960. A small Bible found inside carried an inscription indicating that Pearl had given it to John H. Matthews in 1953, offering a rare personal connection to the Pontiac's previous life.Seat Covers Hid An Incredible SurpriseImage Credit: Sleeperdude / YouTube.The interior initially looked considerably rougher than it actually was. Additional seat covers had been installed over the Pontiac's original upholstery, and Sleeperdude decided to carefully remove them to see what had survived underneath.The result was astonishingly well-preserved factory upholstery. Both front and rear seats emerged looking dramatically fresher than expected, with the protective covers apparently having shielded the material for decades.AdvertisementAdvertisementOther areas weren't quite as fortunate, particularly the carpet and sections exposed to moisture. Still, the preserved seats, dashboard, rubber flooring, and numerous original details left the cabin looking remarkably complete for an unrestored 1949 car.Decades Of Grime Were Hiding Shiny Black PaintImage Credit: Sleeperdude / YouTube.The exterior underwent a similarly dramatic transformation once the accumulated dirt was washed away. Much of the black paint still retained a surprising amount of gloss, something Sleeperdude attributed partly to the car spending decades away from direct sunlight.They carefully removed patches of unwanted white paint, cleaned oxidation from the extensive chrome trim, and hand-waxed the surviving finish. Rather than attempting an aggressive correction that could damage the old paint, they accepted the scratches, dents, and imperfections as part of the car's history.A new set of period-style Firestone Deluxe Champion wide-whitewall tires completed the transformation. Sleeperdude kept the Pontiac's 1960 Knoxville tag in place for the presentation, reinforcing the impression that the car had simply emerged from another era.It Still Isn't Ready For The RoadImage Credit: Sleeperdude / YouTube.The Silver Streak had already cleared one enormous hurdle when its straight-eight was revived, yet Sleeperdude wasn't pretending the cleanup made it roadworthy. The Pontiac still needed work, including a water pump, fuel-system components, and substantial brake servicing before its first proper drive.AdvertisementAdvertisementThat work is planned for a future installment, leaving the car somewhere between rediscovery and revival. Considering that Sleeperdude says this Pontiac and a parts car cost just $3,000 delivered, its extraordinary level of preservation came as an even bigger surprise.The best part may be what they chose not to erase. The faded inspection stickers, imperfect original paint, and decades-old artifacts tell the story of a car that essentially stopped aging in 1960, then waited 66 years for someone to open the door and start looking.If you want more stories like this, follow Guessing Headlights on Yahoo so you don't miss what's coming next.