Which sonobuoy is specifically designed for below-surface detection?

The correct answer indicates that both DICASS and CASS sonobuoys are specifically designed for below-surface detection. DICASS (Directional Command Active Sonobuoy System) employs active sonar to detect submarines and underwater objects. It transmits signals that can identify the location and movement of submerged targets, making it highly effective for below-surface detection.

CASS (Continuous Active Sonobuoy System) also operates using active sonar techniques to continuously monitor underwater activity. Like DICASS, it provides valuable information about submerged contacts, allowing for detailed tracking and engagement.

Both systems utilize different methods but share the primary function of detecting below-surface objects, which is crucial for anti-submarine warfare operations. Understanding the capabilities of these two systems reinforces the importance of effective undersea surveillance in naval operations.