La grande traversée (English: The Great Adventure; also: Voyage of the Sedna (US); The Great Crossing) is a 2003 Canada-France short documentary film written and directed by Jean Lemire and Thierry Piantanida, as well as co-produced and co-narrated by Jean Lemire, made to foster awareness of global warming as seriously jeopardizing a fragile Arctic ecosystem, the first installment of the documentary series Mission Arctique (Arctic Mission), encompassing a five-month 2002 scientific expedition aboard the Sedna IV on a voyage from Montreal to Vancouver through the Northwest Passage, with the "beauty and fragility" of the Canadian Arctic Archipelago on full display.