Sasha manages a firm that installs tombstones at the local cemetery. His many customers have all experienced personal tragedies, but he is full of cynicism. One day, Sasha's 14-year-old daughter appears to bring him back into her life.
Plain film show the audience stops outraged how behave around. At this point it appears that this is the first test viewing the tape, and the hall is not the usual audience and crew.
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.
