Tally marks are etched in to a wall by detainees to keep track of time in a building used, according to a war crimes prosecutor, as a place of torture in Kherson

Torture chambers in Kherson are evidence of Russia's cruel war crimes, say investigators

Ukrainian investigators say they are examining 300 cases of torture in Kherson. They have found cellars where civilians were starved, beaten and given electric shocks during Russia's eight month occupation.