Board of Water Supply. City Water Tunnel No. 3. Making test borings to investigate geology under the East River. Camera located on DeLong drill barge in east channel of East River opposite 35th Avenue in Queens, looking southeast. View shows large drill, driller's helper, superintendent, assorted pipes and drill rods. In background are visible cement silo of old cement block plant, Welfare Island Bridge and smoke stacks of Con Edison plant. Photograph taken by Raymond International Corporation. May 1963.