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City fills in underground vaults of downtown buildings. Why is that?
Many have basement vaults extending under the adjacent sidewalks, not to be confused with tunnels. Salem has its share of tunnel lore. Nearly two miles of tunnels beneath the Oregon State Hospital ...
OKC created an extensive underground tunnel system in the 1970s, connecting major structures
OKC Mayor Patience Latting described the city's underground Metro Concourse network as "the largest pedestrian tunnel system ...