Which system is used to detect submarines by listening underwater and can deploy passive or active sonar?

Which system is used to detect submarines by listening underwater and can deploy passive or active sonar?

• A. Sonobuoy.
• B. Aegis Combat System.
• C. Bulkhead.
• D. Deck hatch.

Answer: (A)

Listening underwater for submarines and using either passive or active sonar to detect them is the specialty of a sonobuoy. These buoy-mounted sensors are dropped from aircraft or launched from ships and carry hydrophones for passive listening, or an active sonar transmitter to emit a ping and then listen for the echo. The gathered data is transmitted back to the aircraft or surface vessel, helping operators locate and track a submarine from a safe distance. This capability is what sets sonobuoys apart from the other items, which are not sensor systems used for submarine detection—the Aegis Combat System is a fleet defense and weapons-control suite, while a bulkhead and a deck hatch are structural elements of a ship.

Listening underwater for submarines and using either passive or active sonar to detect them is the specialty of a sonobuoy. These buoy-mounted sensors are dropped from aircraft or launched from ships and carry hydrophones for passive listening, or an active sonar transmitter to emit a ping and then listen for the echo. The gathered data is transmitted back to the aircraft or surface vessel, helping operators locate and track a submarine from a safe distance. This capability is what sets sonobuoys apart from the other items, which are not sensor systems used for submarine detection—the Aegis Combat System is a fleet defense and weapons-control suite, while a bulkhead and a deck hatch are structural elements of a ship.