Case: GG-2026-176
Status: Historic
Documentation rating: D
Location: Various, Russia
The Soviet Navy “Quackers” are unexplained underwater sounds that former Soviet naval personnel later said were repeatedly detected by submarines during the Cold War, particularly from the 1970s onward. Named former officers described variable croaking or frog-like signals whose apparent sources sometimes seemed to circle submarines, change bearing, or remain near vessels for prolonged periods, leading some crews to nickname the phenomenon “Quackers.” Retrospective accounts also claim that Soviet naval authorities established a special effort to investigate the sounds, initially considering th…
Full case file:
https://gothic.black/Case-Files/id/187