Test results proved excellent, as the aircraft successfully tracked nuclear-powered submarines of the Northern and Pacific Fleets.

The Sound Surveillance System, or Sosus, was used during the cold war exclusively to track the ships and submarines of America's foes.

It also tracked Soviet submarines during the cold war.

During the Cold War, the US Navy set up a network of underwater microphones in many parts of the world to track Soviet submarines.

Both planes were large P-3 Orions, used to track and destroy submarines.

Three years ago the Navy announced that it was abandoning some of the hydrophone sensors it had used to track potentially hostile ships and submarines.

TG 22.4 got underway again just three days later to track several German submarines reportedly heading west toward the Flemish Cap.

She was built as an ocean submarine surveillance vessel to tow highly sensitive sonar arrays to track Soviet submarines during the Cold War.

During the Cold War, the U.S. established an underwater listening post at Midway to track Soviet submarines.

We'd need to have someone working the old sonar grid the navy put down all over the oceans during the Cold War to track submarines.