Anderwater monitoring systems

On the other hand, we denounce with righteous indignation and dislike men who are so beguiled and demoralized by the charms of pleasure of the moment, so blinded by desire

An aviation radio-hydroacoustic device of a passive type of non-directional action is designed to detect moving underwater objects by acoustic signals created by them and retransmit these signals to the receiving carrier and retransmit the signals of the carrier’s radar station.