epa06880933 A general view of the cathedral in the historic city centre, Helsinki, Finland, 26 May 2018 (issued 11 July 2018). The Presidents of Russia and the United States, Vladimir Putin and Donald Trump will meet for a bilateral summit on 16 July 2018 in Helsinki.  EPA/MAURITZ ANTIN
Helsinki, Finland. Proposed 100km tunnel would run from Finnish capital to Estonia's capital Tallin.  EPA

World's longest undersea tunnel hits first blockage

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