12 rescued from houseboats after winter storm causes dock collapse ABCNews A dozen people were rescued after they became trapped in houseboats when the roof of a boat dock collapsed in Tennessee. Rescue crews rushed to the Blue Turtle Bay Marina in Old Hickory, about 20 miles southwest of Nashville, on Wednesday night after receiving reports of several people trapped, according to the Nashville Fire Department. When the fire department arrived, the 100-yard boat dock was in the frigid Cumberland River and inaccessible by foot, officials said. Once a water rescue was launched, 12 people were retrieved from several boats that were taking on water or already sinking.