The film takes place during the full-scale Russian invasion of Ukraine. After the Kakhovka dam is blown up, a detachment of Ukrainian soldiers led by a female fighter with the call sign Mara finds themselves in a secret Soviet bunker at the bottom of a reservoir where the USSR conducted human experiments during the Cold War. The consequences of these experiments are still in the bunker in the form of the half-living corpses of Soviet soldiers. Now, in order to survive, Ukrainians need to defeat the Soviet zombies, their own fear, as well as overcome internal disputes and trust each other.
The tale unfolds around an ancient witch from the Ukrainian town of Konotop, who long ago abandoned her extraordinary powers after falling in love with a mortal man. However, tragedy strikes when her beloved is brutally murdered by the russian soldiers as they occupy Konotop in February 2022. Fueled by grief and a thirst for revenge, she reclaims her supernatural abilities, embarking on a blood-soaked quest to mete out justice to her fiancé's killers.
