Tunnel vision

immense underwater tunnel projects deliver major benefits -- and wrestle with engineering and financial challenges

Underwater tunnel projects require thorough plans and face high levels of uncertainty, largely due to their myriad funders, approval agencies and engineering challenges stretching across long schedules. These factors are currently being tackled by two projects highlighted in this article: the Fehmarnbelt Fixed Link tunnel, a twin-track railway and four-lane motorway linking Denmark and Germany, which will be built on land and then submerged in the Baltic Sea, and the Eurasia Tunnel, which will connect the Asian and European sides of Istanbul, Turkey, via a highway running under the Bosporus Strait.
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