"Early indications are that a contractor doing underground work struck a natural gas line, but the investigation continues, " according to the utility, Missouri Gas Energy.
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.
Resurfacing and underground repair work in the street began on Monday and is expected to last until Friday.
Tube Lines said the report acknowledged that London Underground's work was up to one third more expensive than Tube Lines.
Yet Dr Roberts, whose academic work Underground Maps Unravelled has just been published, doubts his design will ever be used.
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But emergency staff from various ministries were relegated to the basement, and there was often miscommunication, not least because mobile phones did not work underground.
Graduating from the Kyushu Institute of Technology in 1960 with a degree in mining engineering, he discovered there was no work underground, so he joined what is now known as Taiheiyo Cement .
The reception isn't great while travelling at speed and doesn't work at all underground.
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There are already plenty of incentives to work in the underground economy.
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It is hard work crawling around underground, but, Lemaire points out, beetles are at least easier to catch than some other creatures - butterflies, for example.
The shortages are made worse, it said, by excavation work that has severed underground power lines 70 times this year.
The underground station closed in April while work was carried out to refurbish the concourse and facilities, making it "lighter and brighter".
Some who do work are in the bottom fifth because their work is in the underground economy, or in crime, and so is not reported.
Work on the fibre-optic underground cable network will start immediately and be 90% complete by 2014.
But some of the most mesmerizing work space photographs in this collection belong to the lesser-known: the coal miner working nearly half a mile underground, or the two astronauts hard at work 200 miles above it.
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Nor will any of it go towards testing the ones we have by exploding any of them underground - the only way to be absolutely certain they work.
The underground station at Liverpool Lime Street has been closed for four months to allow refurbishment work to take place.
After this, excavation work can start to lay the foundations of the nuclear plant including two underground 3km tunnels for the cooling water.
Macri said Wednesday that the only solution is for the constantly warring governments to work together on expensive and long-term public works projects, creating huge underground drainage pipes to carry increasingly common torrential rains out to the Rio de la Plata.
The phone can also store loyalty programs, present offers, work as a boarding pass and eventually pay at electronic turnstyles, like the London underground, or as announced today, New Jersey Transit trains and buses.
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Howard Collins, London Underground's chief operating officer, criticised the union for demanding to be paid "twice for the same work".
Engineered geothermal systems (EGS) are based on a related principle, but they work even in parts of the world that are not volcanically active, by drilling thousands of metres underground to mimic the design of natural steam or hot-water reservoirs.
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