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MEXICO CITY (AP) - There is a "high possibility" a huge underground drainage tunnel could soon fail, flooding parts of this mountain-ringed metropolis 15 feet deep in sewage, the national water agency said Tuesday.
Officials have been puzzled for years by the gradual decrease in capacity of the 7-yard-wide tunnel built in the 1970s to drain waste water from the valley, which is home to 20 million people and has no natural outlet. They have speculated that the tunnel may be partially clogged or that its walls could be decaying.
But because it is constantly filled with water, officials have not been able to travel through the structure to inspect it — or perform much-needed maintenance.
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