The aim of the work is to determine the physical mechanism for generating acoustic images of jet gas exits from the seabed. To achieve this goal, the dependence of the sound scattering in water on the frequency of sound and bubble diameter is investigated. The problem of formation of gas streams of methane, which is released from the seabed - natural acoustic barrier, is considered. It has been shown that more than 5,000 gas exits have been identified in the Black Sea. The spatial scales of gas outlets in the Black Sea creating acoustic barrier are studied. The theoretical questions of the differentiation of scattering and reflection of sound from gas bubbles of different sizes, depending on the frequency of radar of a sonar, are considered. In the example of the gas bubbles formed by surface excitement (the dimensions are measured by the first millimeters) and bubbles of methane gas jets (the dimensions of the bubbles are measured in centimeters), the differences in the physical mechanisms of their fixation by sonar are shown. It has been shown that for gas jets, the frequency range of 40-50 kHz is least affected by the negative influence of hydroacoustic barrier generated by gas outlets from the seabed. The results of experimental work on the study of hydroacoustic barrier for hydroacoustic locators with a working frequency of 60 kHz, created by gas bubbles with a centimeter diameter are given. The experiment was carried out using a sonar, a gas bubble generator, a remote-controlled underwater vehicle. A diver was used as a target.