STRAWBERRY RESERVOIR, Utah (AP) -- For more than a decade, the remains of several boaters have been hidden in the dark, cold depths of this 26-square-mile lake high in the Uinta National Forest. Then, in a span of just two weeks, Strawberry Reservoir gave up six of its dead during a search for a couple whose boat capsized November 8. What loosened the reservoir's grip on the dead was sonar, which transmits high-frequency waves through water and registers vibrations that bounce off an object. Search and rescue crews in the past dragged the lake for bodies with a triangular sheet...