Construction of the tunnel started in November 2007.
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Proponents of the project argue construction of the tunnel will provide economic benefits for Russia by allowing the country to develop its resource-rich, remote Far East region, while providing the U.S. with a reliable source of long-term energy.
In their 1950s heyday the ferries carried millions of passengers, but these numbers dropped due to competition from rail and the construction of the second Mersey road tunnel in 1971.
Engineers who have assessed the project to build deep underground storage facilities feel it would be a bigger construction challenge than that of the channel tunnel, with tunnelling between 200 and 1, 000 metres.
Sections of a drill which broke through the roof of a rail tunnel came from a construction site above the ground, accident investigators have found.
In June, copper cabling worth tens of thousands of pounds was stolen from the Channel Tunnel Rail Link construction site.
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"Immediate checks revealed that the augering operation was associated with construction activity on land about 13 metres (42ft) above the top of the tunnel, " it added.
Declared the European Green Capital in 2010, Stockholm is investing in new construction like the City Line tunnel, which will put commuter rail lines underground and double the number of trains able to move through the city.
Before any construction work could begin, archaeologists employed by the Channel Tunnel Rail Link project were charged with investigating areas of Kent, Essex and London.
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As the surge invaded this square-mile that comprises the southern tip of Manhattan and the oldest part of the island water swept through the Ground Zero construction site and it completely filled the Battery Park Tunnel.
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