What instrument can determine water leak below the ground?

An acoustic leak detection system is commonly used to identify water leaks below the ground. This instrument detects the sound of water escaping from pipes, utilizing sensitive microphones or sensors to pick up the acoustic signals. Additionally, ground-penetrating radar (GPR) can be employed to visualize underground structures and locate leaks by identifying anomalies in the subsurface. These technologies help pinpoint leaks accurately without extensive excavation.