The problem: The city insisted that the buyers first build a hugely expensive underground parking garage and seawall.

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The coal is deep underground and expensive to extract.

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But going underground is an expensive proposition: The direct costs are much more than those associated with traditional overhead power lines.

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So yes, it is too expensive for the power company to put lines underground, so they will never, ever do it.

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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.

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Tube Lines said the report acknowledged that London Underground's work was up to one third more expensive than Tube Lines.

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They also must take into account that moving electrical lines underground makes routine maintenance of the system more difficult, and thus more expensive.

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