OVERVIEW: The MG-44 Korund is a self-propelled, expendable submarine decoy designed to simulate acoustic signatures for underwater torpedo defense. It is used to deceive and redirect acoustic-homing torpedoes away from the launching submarine.

DETAILS: The MG-44 is launched from 400mm decoy tubes aboard submarines and operates by imitating the sonar and propulsion noise of a real submarine. It is equipped with active and passive acoustic systems to replicate both broadband and tonal signatures detectable by torpedoes. Once released, it maneuvers independently underwater for a limited distance, producing signals that lure incoming torpedoes away from the actual platform. Confirmed operational use includes Russian Delta-class nuclear-powered ballistic missile submarines.

FONCTION:
Launched from a submarine’s 400mm underwater decoy tube.
Activates propulsion and acoustic simulation to mimic submarine signatures.
Attracts torpedoes toward the decoy and away from the submarine.

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