On January 1, 1947, LCDR Thompson and Chief Petty Officer Dixon utilized "Jack Browne" masks and DESCO Oxygen rebreathers to log the first dive by Americans under the Antarctic.
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It was discovered and photographed from the air on January 24, 1947, by United States Navy Operation Highjump, 1946–1947, and named by Rear admiral Richard E. Byrd for Fleet Admiral William D. Leahy, U.S. Navy, who, as naval advisor to President Harry S. Truman at the time of Operation Highjump, assisted materially at the high-level planning and authorization stages.
The cape was plotted from air photos taken by USN Operation Highjump, 1946–48, and named by the Advisory Committee on Antarctic Names (US-ACAN) after Joel R. Poinsett, Secretary of War under President Martin Van Buren, who was instrumental in the compilation and publication of the large number of scientific reports based on the work of the United States Exploring Expedition.
They were named for Admiral Louis E. Denfeld, Chief of Naval Operations and a member of the Joint Chiefs of Staff (1947–49), who helped in the planning and organization of Operation Highjump (1946–47) for which Byrd was leader.
While there he participated in Operation Highjump, a Naval expedition to Antarctica under the command of Admiral Byrd, during which he made the first flight over the Thurston Peninsula and later rescued six survivors of another flight over the same area.
It was photographed from the air by U.S. Navy Operation Highjump, 1946–47, was charted by the French Antarctic Expedition, 1952–53, and named by them for Paul Janet, a French spiritualist-philosopher of the 19th century.
Delineated in 1952 by John H. Roscoe from air photos taken by U.S. Navy Operation Highjump (1946-47), and named by him for Lieutenant Commander William J. Rogers, Jr., U.S. Navy, plane commander of one of the three air crews during Operation Highjump which took air photos of the coastal areas between 14 and 164 East longitude.
The feature was renamed Ellis Fjord by Roscoe after Edwin E. Ellis, aerial photographer on U.S. Navy Operation Highjump flights over this area.
It was mapped by Norwegian cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named for Edwin E. Ellis, aerial photographer on Operation Highjump photographic flights in this area and other coastal areas between 14°E and 164°E.