I've told this story on other threads, but it seems like I need to tell it here.
My cousin Lenny was driving home late at night from an insurance conference. He got off the interstate to get gasoline, and got turned around coming out of the station trying to get back to the interstate. Drove down what he thought was a two-lane country road. It was a boat ramp. The ONLY reason he is not a missing person today is that a woman was letting her dogs out and heard the splash of the car hitting the water. His vehicle traveled many yards out into the water before it sank, drowning him.
My daughter's FIL fished in the St. Joseph River every Thursday for decades. About ten years ago, they pulled a car from the river just a few feet from his launch spot. It contained the body of a long-missing woman. It had been in the water for over ten years.
YES- we need the services of America's fishermen to examine all of the little lakes and ponds of this country for missing persons in their vehicles. I would wager a large portion of the 'missing and the car is missing too' cases have a watery solution!