灰とダイヤモンド
Kanał (, "Sewer") is a 1957 Polish film directed by Andrzej Wajda. It was the first film made about the 1944 Warsaw Uprising, telling the story of a company of Home Army resistance fighters escaping the Nazi onslaught through the city's sewers. "Kanał" is the second film of Wajda's War Trilogy, preceded by "A Generation" and followed by "Ashes and Diamonds".