For example, take Advanced Underground Construction, an Iowa-based company, and its principal, William David Ward II.
When Athens was preparing to host the 2004 Summer Olympics, construction of the underground metro encountered so many archaeological significant sites that delays lasted for years.
It was not known early Wednesday whether the contractor said by Missouri Gas Energy to have been doing underground work was connected to the construction project.
In many parts of the country, construction is a significant part of the underground economy.
It would involve the construction of a dam, reservoir, underground power station and water tunnels in the hills above Loch Lochy.
This setback came a week after the announcement of further delays on one of Britain's largest construction projects, the extension of London Underground's Jubilee Line from Westminster to Stratford in east London.
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.
In March, a multi-million-pound fraud trial over the construction of the Jubilee Line on London's underground was abandoned after nearly two years when a disgruntled juror walked out.
They were all held in the same tiny underground cell with Roy Hallums, an American contractor working for a Saudi construction company who was kidnapped, perhaps with Al-Zubayi's involvement, in late 2004.
The Taipei underground railway, for example, saw its budget rise more than fourfold during construction.
The site was originally intended to be a parking garage until construction uncovered a series of Roman ruins, now preserved in the underground Antiquarium museum.
An example is engineering and construction group Balfour Beatty, one of the preferred bidders for London Underground PPP, which reported in August that PFIs underpinned its 17% rise in underlying profit growth.
Other improvements will include the running of new and some existing high voltage cables underground, particularly where they affect areas of outstanding natural beauty, and the construction of a new undersea link connecting Scotland with England and Wales.
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.
They also enjoy a continuing monopoly over construction and civil engineering projects, from dams to bridges, and highways to metropolitan underground light railways.
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