paragraph_text: Endurance Glacier is a broad glacier north of Mount Elder, draining south-east to the south coast of Elephant Island in the South Shetland Islands of Antarctica, and is the main discharge glacier on the island. It was named by the UK Antarctic Place-Names Committee after HMS "Endurance" (Captain P.W. Buchanan, Royal Navy), which anchored off the glacier on several occasions in support of the Joint Services Expedition to Elephant Island, 1970–71.

paragraph_text: Cape Yelcho is the northwestern extremity of Elephant Island in the South Shetland Islands of Antarctica. It was named by the UK Joint Services Expedition, 1970–71, after the Chilean steam tug "Yelcho".

paragraph_text: It is located entirely within the county of Cumbria, and all the land in England higher than 3,000 feet (910 m) above sea level lies within the National Park, including Scafell Pike, the highest mountain in England. It also contains the deepest and longest bodies of water in England, respectively Wast Water and Windermere.

paragraph_text: Forward Harbour was a cannery town in the Johnstone Strait region of the Central Coast of British Columbia, Canada, located on the inlet of the same name, which is on the mainland side of Wellbore Channel, to the east of Hardwicke Island. Nearby on the same vicinity on the Mainland, though fronting on other bodies of water, are Jackson Bay to the immediate north, off Sunderland Channel, and Heydon Bay, British Columbia to the east on Loughborough Inlet.

paragraph_text: Goa Gajah, or Elephant Cave, is located on the island of Bali near Ubud, in Indonesia. Built in the 9th century, it served as a sanctuary.

paragraph_text: Saddleback Point is a headland on the northern coast of Elephant Island, in the South Shetland Islands of Antarctica. The site lies to the west of Point Wild.

paragraph_text: The Elephant Cays are a group of small islands lying towards the southern end of Falkland Sound, just to the north-west of Speedwell Island, in the Falkland Islands of the South Atlantic Ocean. The group, with a collective area of 248 ha includes Golden Knob, Sandy Cay, West, Southwest and Stinker Islands. It has been identified by BirdLife International as an Important Bird Area (IBA).

paragraph_text: Mount Pendragon is a mountain (975 m high) north-west of Cape Lookout, Elephant Island, in the South Shetland Islands of Antarctica. It was mapped by the UK Joint Services Expedition, 1970-71. The name was applied to this highest mountain on Elephant Island by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1971 and acknowledges Prince Charles, the Prince of Wales, as royal patron of the Joint Services Expedition. Pendragon is the ancient title for a Welsh Prince.

paragraph_text: Telish Rock (, ‘Skala Telish’ ska-'la te-'lish) is the islet off the south coast of Livingston Island in the South Shetland Islands, Antarctica situated south of Elephant Point and northwest by west of Enchantress Rocks. Extending . The area was visited by early 19th century sealers.

paragraph_text: ``Crab Island, ''was actually two islands made from sand that the Army Corps of Engineers dredged up from the East Pass. These islands were large enough to inhabit sea grass, small shrubs and nesting seabirds. It has been reduced to a significant sandbar, which appears only when the tide is out. It has become a popular anchorage in the area. The entrance to Destin Harbor, a lagoon between the beaches and the main body of the western portion of the peninsula, is located just north of the East Pass jetty. The lagoon is formed by a sand spit named Holiday Isle; many condominiums have been built along the harbor since the 1970s.

paragraph_text: The refuge, which can accommodate up to 6 scientists for up to 40 days, depends both logistically and administratively on Comandante Ferraz station. Together with Refuge Emílio Goeldi, located on Elephant Island, constitute the basic infra-structure to support the Brazilian Antarctic Program in Antarctica.

paragraph_text: Norfolk Island is located in the South Pacific Ocean, east of the Australian mainland. Norfolk Island is the main island of the island group the territory encompasses and is located at 29°02′S 167°57′E﻿ / ﻿29.033°S 167.950°E﻿ / -29.033; 167.950. It has an area of 34.6 square kilometres (13.4 sq mi), with no large-scale internal bodies of water and 32 km (20 mi) of coastline. The island's highest point is Mount Bates (319 metres (1,047 feet) above sea level), located in the northwest quadrant of the island. The majority of the terrain is suitable for farming and other agricultural uses. Phillip Island, the second largest island of the territory, is located at 29°07′S 167°57′E﻿ / ﻿29.117°S 167.950°E﻿ / -29.117; 167.950, seven kilometres (4.3 miles) south of the main island.

paragraph_text: Supalai Park Towers are 3 residential high-rise buildings located on Soi Phahonyothin 21, Chatuchak district, Bangkok, Thailand. The three towers have 33 floors and were all completed in 2003. Opposite Supalai Park Towers is the Elephant Building, and next to the towers lies Index Living Mall.

paragraph_text: Point Wordie is a headland on the western coast of Elephant Island, in the South Shetland Islands of Antarctica. The site is named after James Wordie, a Scottish geologist who participated in Ernest Shackleton’s Imperial Trans-Antarctic Expedition, 1914-1917.

paragraph_text: The Mirounga Flats () are a small partially enclosed tidal area in the inner, northwestern corner of Borge Bay, Signy Island, in the South Orkney Islands off Antarctica. The area's eastern limit is formed by the Thule Islands; its northern and western limits by Signy Island. The tidal area dries at low water. The flats were roughly surveyed in 1933 by Discovery Investigations personnel, and were resurveyed in 1947 by the Falkland Islands Dependencies Survey (FIDS). The feature was so named by the FIDS because elephant seals ("Mirounga leonina") are found there in large numbers during the moulting period.

paragraph_text: Elephant Island is an ice-covered mountainous island off the coast of Antarctica in the outer reaches of the South Shetland Islands, in the Southern Ocean. Its name was possibly given by early explorers sighting elephant seals on its shores. The island is situated north-northeast of the tip of the Antarctic Peninsula, west-southwest of South Georgia, south of the Falkland Islands, and southeast of Cape Horn. It is within the Antarctic claims of Argentina, Chile and the UK. Brazil has a shelter on the island, Goeldi, supporting the work of up to six researchers each during the summer and had another (Wiltgen), which was dismantled in the summer of 1997/98.

paragraph_text: Butterfly Pond, also known as Aldrich Brook, is a body of water in the town of Lincoln, in Providence County, Rhode Island.

paragraph_text: Rodman Cove is a cove south of Cape Lindsey on the west coast of Elephant Island, in the South Shetland Islands of Antarctica. It was named for Benjamin Rodman of New Bedford, Massachusetts, owner of whaling ships operating from that port in the 1820s and 1830s. The name was suggested by American geographer Lawrence Martin and has appeared in descriptions and charts of Elephant Island since about 1943.

paragraph_text: By way of his voyages in the 1770s, Captain James Cook proved that waters encompassed the southern latitudes of the globe. Since then, geographers have disagreed on the Southern Ocean's northern boundary or even existence, considering the waters as various parts of the Pacific, Atlantic, and Indian Oceans, instead. However, according to Commodore John Leech of the International Hydrographic Organization (IHO), this situation has no scientific sense since it has different ecosystem and life from the three oceans mentioned before and is located on a southern portion of Earth, hence the name of an ocean. This remains the current official policy of the IHO, since a 2000 revision of its definitions including the Southern Ocean as the waters south of the 60th parallel has not yet been adopted. Others regard the seasonally - fluctuating Antarctic Convergence as the natural boundary.

paragraph_text: Mirounga Point () is the east entrance point to Potter Cove, King George Island, in the South Shetland Islands off Antarctica. The feature was called "Punta Baliza" (beacon point) by R. Araya and F. Herve in 1966. It was later called "Punta Elefante" by the Argentine Antarctic Expedition after the elephant seal ("Mirounga leonina"), in connection with the establishment of Site of Special Scientific Interest number 13 (now Antarctic Specially Protected Area 132) in this vicinity under the Antarctic Treaty. The approved name avoids the duplication of Elephant Point on Livingston Island.

Question: When did the ocean in which Elephant Island is located become a thing?
Answer: the 1770s