Open Polar Sea
The Open Polar Sea was a hypothesized ice-free ocean surrounding the North Pole. This unproved and eventually-disproved theory was once so widely believed that many exploring expeditions used it as justification for attempts to reach the North Pole by sea or to find a navigable sea route between Europe and the Pacific across the North Pole. History. The theory that the North Pole region might be a practical sea route goes back to at least the 16th century, when it was suggested by Robert Thorne. The explorers William Barents and Henry Hudson also believed in  the Open Polar Sea. For a time, the theory was put aside because of the practical experience of navigators who encountered impenetrable ice as they went north. However, the idea was revived again in the mid-19th century by theoretical geographers, such as Matthew F. Maury and August Petermann. At the time, interest in polar exploration was high because of the search for John Franklin's missing expedition, and many would-be polar explorers took up the theory, including Elisha Kent Kane, Dr. Isaac Israel Hayes, and George Washington De Long. It was believed that once a ship broke through the  regions of thick ice that had stopped previous explorers, a temperate sea would be found beyond it. Support. Although it is now known that the North Pole was covered with thick ice for much of the period, the Open Polar Sea was a popular theory in the 16th to the 19th centuries, and many arguments were made to justify its existence: Disproof and re-emergence. The Open Polar Sea was debunked gradually by the failure of the expeditions in the 1810s to the 1880s to navigate the polar sea. Reports of open water by earlier explorers, such as Elisha Kent  Kane and Isaac Israel Hayes, fueled optimism in the theory in the 1850s and 1860s. Support faded when George W. De Long sailed into the Bering Strait in the hope of finding an open gateway to the North Pole and was met by a sea of ice. After a long drift, pack ice crushed the "Jeannette", and her survivors returned home with first hand accounts of an ice-covered polar sea. Other explorers such as British explorer George Nares confirmed it. When Fridtjof Nansen and Otto Sverdrup drifted through the polar ice pack in "Fram" in 1893 to 1895, the  Open Polar Sea was a defunct theory. Nevertheless, scientific studies of global warming in the 2000s project that by the end of the 21st century, the annual summer withdrawal of the polar ice cap could expose large areas of the Arctic Ocean as open water, and an ice-free Arctic is possible in the future because of Arctic shrinkage. Although the North Pole itself could potentially remain ice-covered in winter, a navigable seasonal sea passage from Europe to the Pacific could develop along the north coast of Asia.