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World’s Longest Undersea Rail Link Is Getting Back on Track

Helsinki City Views Amid Heatwave Warning
Photographer: Chris Ratcliffe/Bloomberg

The world’s longest undersea rail tunnel is inching closer to becoming a reality.

The new Estonian government is reviving a project that would connect its capital Tallinn with Helsinki in Finland — a more than 100-kilometer (62-mile) tunnel that could cost as much as 20 billion euros ($24 billion). The plans looked dead last year because of the private, Finnish-led project’s Chinese links.