Processing Floor Drain

The bathhouse hall runs straight from end to end, its tiled floor broken by a drainage channel down the centre and flanked on either side by U-shaped concrete baths. Square windows at the far wall catch the low angle of a setting sun, sending light the length of the room and into the water pooled across the tiles. Exposed pipework follows the walls; concrete columns divide the space into bays. The communal bathhouse was a designed part of island life at Ikeshima Coal Mine. Because the island measures roughly 1.08 km² and sits about 7 km off the Nishi-Sonogi Peninsula, the operator, Matsushima Coal Mining, could not spread the settlement outward the way a mainland coal town would. Instead it built upward, in reinforced-concrete high-rise apartment blocks, and provided shared facilities, including bathhouses with hot-water supply, to serve a population that reached nearly 7,800 in 1970. Ikeshima Coal Mine began commercial output in 1959, the last new colliery sunk in Japan, and worked entirely beneath the seabed, with the deepest levels reaching about 650 m below sea level. The island ran its own coal-fired power station and a seawater-desalination plant from 1967, an isolated community that had to generate everything it needed. At its peak in 1985 the mine raised more than 1.5 million tonnes of coal in a year. It closed on 29 November 2001 as the last large-scale coal mine in Japan. By 2021 the island's resident population had fallen to 111. The apartment blocks and the shopping street stand largely disused. The bathhouse, its pipework intact and its baths still in place, holds the light of a 2026 afternoon in a room built for thousands.