Senior Editor Bob Sillery looks back at a $1 million behemoth that had an 11-foot-diameter head and could bore through 400 feet of rock a day.
By Bob SilleryPosted 06.06.2002 at 4:07 pm 0 Comments
In the world of power, there's big, and then there's monstrous. Back in 1973, our try-anything reporter, Rob Gannon, sat inside a 175-ton, 1,105-horsepower tunnel-boring machine made by Ingersoll-Rand as it chewed through 5 1/2 miles of hard siltstone and shale to dig a sewage tunnel beneath Rochester, New York. That $1 million behemoth had an 11-foot-diameter head and could bore through 400 feet of rock a day.