The Bratvaag Expedition was a Norwegian expedition in 1930 led by Dr. Gunnar Horn, whose official tasks were hunting seals and to study glaciers and seas in the Svalbard Arctic region. The name of the expedition was taken from its ship, M/S Bratvaag of Ålesund, in which captain had sailed the Arctic seas for more than twenty years. The Bratvaag Expedition had a secret, but important mission: the annexation of Victoria Island for Norway. Although a successful landing on the island was achieved, Victoria Island was later annexed by the Soviet Union. The Bratvaag Expedition became nevertheless well-known due to the findings on Kvitøya of the long-lost remains of the Swedish explorer S. A. Andrée's Arctic balloon expedition of 1897.