The Mizunami Underground Research Laboratory consists of underground facilities (research shafts) and surface facilities. The conceptual design includes two 1,000 m deep shafts, the Main Shaft (6.5m f and the Ventilation Shaft (4.5m fƒ‚), and two research stages, the Middle Stage at 500 m depth and the Main Stage at 1,000 m (a). Surface facilities include excavation equipment, head frame, hoists, water-treatment facility, and electrical plant (b).