In 1970 Digicon Alaska, Inc. began a combined gravity and seismic survey in the Norton Sound region of Alaska. Digicon contracted with ERA Helicopters, Inc., for logistical support of the formers shore stations and for transportation of supplies and personnel between the shore and Digicons offshore survey vessel. On July 13, 1970, an ERA helicopter was dispatched to Digicons offshore vessel to remove an S-33 gravity meter so that welding could be carried out on the vessel without damaging this sensitive meter. The S-33 gravity meter was crated and strapped to the helicopter and transported to shore. When the welding was completed, the helicopter left shore to return the S-33 meter to the vessel. Unable to locate the vessel and unable to return to shore because of lack of fuel, the pilot set the helicopter down in Norton Sound. While awaiting rescue, the helicopter overturned and the S-33 meter broke free of its bindings. Subsequently, the gravity meter was recovered in a damaged condition when it was washed ashore.