Construction While in Brazil the São Paulo-Rio high-speed train never materialized, China plans to tunnel 120 km under the sea to connect two cities by rail — 90 km will be underwater, with trains at 250 km/h, and the 8-hour journey will be reduced to 40 minutes. Douglas Avila 23/04/2026 at 00:31
Construction The Most Ambitious Undersea Tunnel on the Planet: A Project of Up to 135 Km Under the Sea and Estimates Exceeding $60 Billion Could Connect Two Rival Regions in Asia and Rewrite Asia’s Geopolitics Valdemar Medeiros 31/10/2025 at 15:12
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