At the Array Operation Site (5,000m asl.), the interior finish work of the AOS building is proceeding along with the installation of lightning rods and fuel tanks outside the building. At the construction site, safety control measures are strictly implemented and you have to wear a helmet and safety boots to enter the building. The picture shows the interior finish work on the heat insulation material. Seven workers are working together to precisely measure the position of the components using a distance measuring instrument called theodoliteE