Theyearis2014.MishkoandLevarefellowvillagersservingontheminesweeper“Cherkasy”,ashipoftheUkrainianNavystationedintheportoftheCrimeanLakeDonuzlavthatisconnectedtotheBlackSea.WhentheinvasionofCrimeabytheinfamous“littlegreenmen”beginsandPresidentYanukovychfleesthecountry,the“Cherkasy”andothershipsoftheUkrainianfleetareblockedonthelake.SuccessiveUkrainianshipssurrendertotheRussians.Onlythecrewofthe\"Cherkasy\"decidetoresist.Meanwhile,theRussianspreparetoattacktheminesweeper.Thecrewhavetodecidewhethertodefendthemselvesatallcostandtotheveryend.Basedontrueevents,thisisastoryaboutthelastwarshipinCrimeatosailundertheUkrainianflag.