The PASS is an efficient instrument that takes advantage of its strengths of utilizing the light where it travels the best i.e. the air. And the sound, where the sound travels extremely well, i.e. in the water. The system has a LASER that throws a beam of light, which gets absorbed at the surface of the water and is then converted into sound waves. These sound waves further travel through water and get reflected from the underwater objects and reach the instrument above where they are converted into electrical signals. This reception of the reflected sound waves takes place through extremely sensitive sensors called transducers. Then PASS also has intelligent algorithms that jot down the received sound signals as pieces of a jigsaw puzzle and produce the required 3-D image of the corresponding underwater object.