Ancient North Martian

Ancient North Martian was a language spoken on Mars, presumably by the Ice Warriors. The Tenth Doctor knew the language and spoke in Ancient North Martian, specifically the sentence, "Hoorghwall in schtochman ahn warrellinsh och fortabellan iin hoorgwahn", to Margaret Cain when she was possessed by the Flood. As Ed Gold noted, she seemed to recognise it. (TV: The Waters of Mars)