The Verge had a good story, Into the vault: the operation to rescue Manhattan's drowned internet. Some details and lots of pictures of Verizon's efforts at repairs after Hurricane Sandy.
"Levendos explains to me that before crews could even begin removing water, they needed to repair ground-level fuel pumps to feed backup diesel generators on the upper floors. Two mobile generator trailers were brought in, and they remained in use when I visited, as local power utility Con Ed worked to reconnect the building to the grid. Workers then used trucks to pump dry air through the copper wiring — a job that’s typically handled by air pumps in the basement that were rendered useless by the storm surge. It was too late for the decades-old copper wiring, which was submerged for the better part of two days. After crews sent test signals into the copper, Levendos says he was 'left with the conclusion here that much of what is around me has been destroyed.'
Miles of copper is ruined not only in the cable vault at Broad Street, but also at 20 or so manholes around the area. Even worse, paper insulation in the copper wiring sucks water through the cabling from capillary action, destroying cabling even in dry areas. Levendos says it’s 'far too tedious, time consuming, and not effective of a process to try and put this infrastructure back together,' so Verizon’s taking the opportunity to rewire with fiber optics instead. Service has been restored to FiOS customers for over a week — unlike copper, fiber optics aren’t damaged by the water. As part of this process, crews have already pulled fiber up the major corridors — including Water, Broad, and Pearl Streets — to ultimately connect the fiber network to buildings."
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