Divers have resumed their search for three snowmobilers who crashed through ice in Rangeley Lake last winter. Maine State Police and the Maine Warden Service were focusing on the area where the three machines went through the ice on Dec. 31. Recovery efforts for Ken Henderson, 40; Glenn Henderson, 43, of Sabattus; and John Spencer, 41, of Litchfield, continued until late February. The resumption of the search Tuesday included the use of underwater sonar and cadaver dogs. Previous searches with an underwater camera and sonar spotted two of the men’s snowmobiles.