Law enforcement officials in Maine are working on an unusual case. They’re trying to determine how a 1974 Chevrolet Camaro ended up at the bottom of Sebago Lake, which is about an hour from Portland.

Jason Smith, an underwater explorer, discovered the Camaro about 55 feet below the surface while trying to find a snowmobile that he had spotted on an earlier trip. Footage of the car posted on his Facebook page shows a Z28 model with stripes, a rear spoiler, and trim-specific 15-inch wheels. He didn’t go as far as capturing footage of the RPO codes, but we’re willing to bet the car is finished in Light Gold Metallic.

Ran when parked? Maybe. Smith alerted the Cumberland County sheriff’s office, which fished the car out of the lake and started looking for clues. Its license plates were gone, the windows were open, and the trunk was empty with the exception of parts of an old tent, according to Portland-based news channel WGME.

Keith Cook, one of the sheriff’s office’s detectives, found a partial VIN and enlisted the help of the Bureau of Motor Vehicles to piece together the full sequence. The BMV is still looking for any and all information it might have about the car, though it sounds like it hasn’t been registered in several decades. The Z28 spent enough time underwater that it crumbled to pieces after a salvage crew pulled it up to the surface.

Smith told WGME he found the Camaro near the middle of the channel separating Frye Island from the mainland, which fueled speculation that it could have fallen off a ferry, but that theory was quickly ruled out. The team that runs the ferry service told investigators that a car falling off a boat in the middle of a lake would have made waves (pardon the pun). The incident would have been recorded, the car would have been recovered as quickly as possible, and locals would still be talking about the Camaro that took a bath on its way to Frye Island. It’s also too far away from the shore to have been pushed into the water.

The most logical explanation is that the Z28 was driven onto the lake in the winter and fell through the ice. Cast in that light, Smith is lucky he didn’t find the driver in the driver’s seat. Investigators are hoping that tracking down the owner, or a relative, will help them solve the mystery of the Sebago Camaro.