MARQUETTE, Iowa — Authorities on Wednesday successfully fished out a long-submerged vehicle from the Mississippi River at Marquette.

Nothing suspicious was found inside, but how the vehicle ended up underwater near the city boat ramp still remains a mystery, the Clayton County Sheriff’s Department reported Thursday.

The vehicle was first noticed underwater in 2017 by a local fisherman using side-imaging sonar, and it was initially examined that November by a dive unit from La Crosse County, Wis., though it could not be retrieved, a press release states.

“Over almost the next three years, river stage levels and environmental restrictions have prevented further attempts,” it states.

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But low river levels and stable conditions allowed the vehicle — a 1985 Lincoln Town Car — to be pulled from the river Wednesday.

How it got there still remains a mystery. And while it had been underwater for at least three years, it could have been much longer.

Authorities reported that the car was last registered in Wisconsin in 2007.