In the blink of an eye, a dip in the water this summer could turn deadly.
It can happen when swimmers get an electric shock from stray voltage in the water.
In Virginia, Smith Mountain Lake Marine Volunteer Fire Rescue crews are encouraging lake residents to have their docks tested for stray voltage in the water, and to keep metal boat lifts out of the water.
Karl Martin with the Department of Game and Inland Fisheries says many of the docks around the lake were wired more than 50 years ago, and may need to be updated to meet code.
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