C1257 Escape

Active sonar!

Supporter class submarines were installed with advanced sonar System, including the 2046 Drag Very Low Frequency Passive Array sonar. 2040 The bow of the ship was on alert, the 2041 ship's shell was on the passive array sonar, and the 2019 passive range sonar.

Looking at the models of the sonar, one could see that there were very few active sonars. Most of them were passive ones