The survival of the West depended on hearing a ghost in the water—a capability the Ministry of Defence tracked through hardware exploitation and records kept secret for decades.
The sonic fingerprints of the Soviet Union's most lethal nuclear deterrent were cataloged in a technical sequence that stripped away the methods of collection to protect the hunters.
Personnel posed as scientists to mask Soviet submarine tracking, a secret the Navy later modernized into a centralized network to eliminate reporting delays for the fleet.
Submerged vessels were stripped of their secrets by a specialized acoustic dragnet that turned the vast Atlantic and Pacific into a series of data points to be tracked.
Foreign ships were watched entering and exiting ports as the Navy unobtrusively placed portable sensor nets in the shallow waters of potential adversaries to track stealthy submarines.