What is the function of a lead line?

The function of a lead line is to measure depth, which is crucial for safely navigating underwater environments. A lead line typically consists of a long rope with a weight, often made of metal, at one end. When deployed, the weight sinks to the bottom, allowing the user to directly measure the depth by noting how much of the line is submerged. This measurement is vital for various activities, such as fishing, dredging, or ensuring safe passage for submerged vehicles, as it helps prevent accidents by providing awareness of how deep the water is in a particular area. The accurate measurement of depth is essential in avoiding potential hazards and ensuring effective operations during underwater activities.