The situation from the leak can be determined from the depth in the sound along with the way from which it's coming. This technique is helpful for equally pressurized and non-pressurized systems. The DAS process requires the same set up of fiber-optic cable together the length of pipeline getting monitored. https://leakcorrelator08641.tribunablog.com/the-greatest-guide-to-double-walled-tank-leak-detection-46564576