The present invention using the sound waves directed to a superficial stratum probe (Subbottom Profiler) for analyzing the strata of the seabed, according to the invention, leading the superficial layers probe hanging aft of the vessel or attached through the installation frame on the side of the ship to result from use by an obstacle such as a fishing ground with the frequent case where superficial layers probe is damaged or lost in the prior art as well as the cost for the repair or replacement of equipment was a problem of additional damage in accordance with the time delay to solve the problems of shallow strata sensing apparatus and method, a space in the vicinity of the center of the vessel skirt and shallow resin layer damage and loss caused by making the probe mounting boxes for fisheries or obstruction by mounting the superficial layers probe into the space prevention of risks, shake the sense due to the waves and birds , And, by forming a bottom surface of the box to the FRP material protects the transducer by ensuring that the transducer is not exposed to the outside and, at this time, and reduce the noise by having completely pressed against the transducer and the bottom surface inside of the box space by filling the sea water as well as possible to proceed with exploration in the same environment and the external environment, a hull-mounted superficial layers exploration system capable of leveling that is configured to be freely adjustable to level the superficial layers probe is provided.