: The season opens with a shocking accident involving Rykov and Arefyeva . While Rykov survives without life-threatening injuries, Olga Arefyeva suffers a severe head injury and falls into a coma.
: Konstantin Kulygin attends a jubilee celebration for Kamchatka , but the event is interrupted by a police raid. Kulygin is arrested and finds himself in a jail cell alongside the character Grom . Season 4, Episode 2: "Complications" : The season opens with a shocking accident
: Lomagin begins to feel increasingly unwell. It is eventually revealed that he is suffering from a serious condition, later identified as leukemia. later identified as leukemia.