OVERVIEW: The MG-74 is a self-propelled, expendable submarine decoy designed to counter acoustic-homing torpedoes. It simulates the acoustic and movement profile of a submarine to lure torpedoes away from the host platform.

DETAILS: The MG-74, also known as Korund-2, is launched from 533mm decoy tubes aboard Soviet/Russian submarines and is designed to simulate the acoustic signature of the launching vessel. It is equipped with both passive and active acoustic emitters and operates autonomously after launch, maneuvering underwater to imitate submarine propulsion and noise. Confirmed users include Russian Navy platforms such as Akula- and Delta-class submarines. It is reported to be used in conjunction with the REPS-324 Shlagbaum external launch system and has an estimated effective range of up to 1.9 km, although exact performance data remains classified or unverified.

FONCTION:
Launched underwater from a 533mm decoy or torpedo tube.
Activates internal propulsion and begins acoustic signal simulation.
Misleads tracking torpedoes by imitating a real submarine’s sonar profile.

SOURCE:
Wikipedia (https://en.wikipedia.org/wiki/Sonar_decoy) ; Federation of American Scientists (FAS) ; russianships.info ; GlobalSecurity.org