E-Mart, another retailer, says sales of bleach fell by 38% in the three weeks following Lotte’s apology; dehumidifying detergents dropped by almost half.

So inside and out, the arch is covered in stainless steel, and dehumidified air will be circulated around the structure’s steel trusses to prevent rust.

By opening new routes to the outside, researchers could cool and dehumidify the air in mines that are too warm and wet.