World’s longest road and rail tunnel is being built under the Baltic Sea
By Jacopo Prisco, CNN (CNN) — Descending up to 40 meters beneath the Baltic Sea, the world’s longest immersed tunnel will link Denmark and Germany, slashing journey times between the two countries when it opens in 2029. The first tunnel element of the Fehmarnbelt Tunnel was inaugurated June 17 by King Frederik X of Denmark,
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