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NEW LONDON, Conn. Navy divers are replacing a little-known, 20-year-old system of sensors and cables in the Thames River between New London and Groton that measures the magnetic signatures of military ships and submarines.
The Day of New London reports the $3.5 million project began Nov. 1 and is expected to be finished next August.
The Navy measures the magnetic signatures of its ships and submarines to make sure they don't trigger magnetic mines or make the vessels easier to detect. Magnetic fields surround steel-hulled ships and change as the ships move through natural magnetic fields between the North and South poles.
Information from the sensors is used to determine whether to reduce a ship's magnetization.
The Navy submarine base in Groton operates the only magnetic silencing facility in the Northeast.