The Transpolar Sea Route (TSR) is a future Arctic shipping route running from the Atlantic Ocean to the Pacific Ocean across the center of the Arctic Ocean. The route is also sometimes called Trans-Arctic Route. In contrast to the Northeast Passage (including the Northern Sea Route) and the Northwest Passage it largely avoids the territorial waters of Arctic states and lies in international high seas. The route is currently only navigable by heavy icebreakers. However, due to the increasing decline of Arctic sea ice extent, the route is slated to emerge as the predominant Arctic shipping route by 2030.