Helsinki - the capital of the unusual. City all the time at the hearing: in his honor named the Moscow Helsinki Group, are regularly held various summits and meetings, hosted the Olympic Games and Eurovision. The existence of Helsinki is known to all, no worse than the existence of Rome, Paris or New York, but if Rome is associated with the Colosseum, Paris with the Eiffel Tower, and New York with the Statue of Liberty, the Helsinki the average person is not associated with anything.
The distance from Tallinn to Helsinki by sea - only 80 kilometers. Overland comes exactly ten times more, in addition, across the border with Russia, not part of the Schengen area, so it was logical that 97% of passengers between the two capitals rests on the ferries.