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The cost per meter to go underground is exhorbitant compared to above ground to install. The cost per meter underground is exhorbitant compared to above ground to repair.
Lots of new communities, when planned for from the outset, go underground. Retrofitting existing infrastructure would be staggering in cost.
I remember Germany had it's utilities placed underground, damn the cost, so that it would support the military in case of war and suffer less damage that would occur than had the utilities been located above ground. But they also build homes of concrete 30-40CM thick to protect occupants and have mechanical or electrical roller shutters to protect your glass.
They also have/had a higher degree of worry of a ground war fought on their soil... Ahhh, to go back to the safe days of the Fulda Gap
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