Columbus is building an underground storm sewer tunnel which will be the largest public works project in the city’s history. The 4-mile long storm water sewer tunnel is 175 feet under the city and is nearly complete with 3,000 feet to go. At 5-feet an hour, the massive 95-ton drill is doing its best to churn through miles of limestone. The city’s combined storm water and sewer system have become overloaded during heavy rains. The sewer lines have not been
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