A Detector Destroyer is a type of naval vessel that is equipped with four different technologies to detect and destroy enemy ships. These technologies include Sonar, RADAR, NOSE, and ALARM. Sonar is a system that uses sound waves to detect objects underwater. RADAR is a system that uses radio waves to detect objects in the air or on the surface of the water. NOSE is a system that uses smell to detect objects in the air. ALARM is a system that detects objects by sound or vibration.