Finland carved an entire underground city into the bedrock beneath Helsinki, filling it with swimming pools, sports halls, parking areas, and shopping spaces that can be rapidly converted into blast-r
Published on: July 10, 2026, 6:46 p.m. | Source: Times of India
Rest of World News: Explore the vast underground city of Helsinki, where tunnels serve as shelters and everyday facilities like gyms and pools, designed for emergency preparedness and urban living.
