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https://www.nst.com.my/world/2018/08/398481/beijing-planning-worlds-longest-rail-tunnel-between-china-taiwan
HONG KONG: After years of debate, Chinese scientists are close to a consensus on the design for what would be the world’s longest undersea railway tunnel, connecting the mainland to Taiwan.
If realised, shuttle trains could be whizzing through a 135 kilometre undersea section of the tunnel at up to 250km per hour by 2030.