When pressure pipelines leak, water gushes out of the break into the surrounding area. The pipe material vibrates at the leakage point. These vibrations are transmitted by the pipe and can even be noticed at distant contact points, e.g. fittings & valves. This is known as structure-borne sound and is made audible using highly sensitive listening devices. AUSTRALIAN SUBSURFACE can locate leaks using an array of specialised equipment. Leak detection Canberra.