The Secret Land is a feature-length 1948 documentary film about the United States Navy expedition code-named "Operation Highjump" to Antarctica in 1946.

[3][4] The film re-enacts scenes from several critical moments during the operation, such as shipboard damage control and Rear Admiral Richard E. Byrd throwing items out of an airplane to lighten it to avoid crashing when one of its engines failed and the other began to falter under the excess load.

Another scene features Chief of Naval Operations Fleet Admiral Chester W. Nimitz discussing Operation Highjump with admirals Richard E. Byrd and Richard H. Cruzen prior to their departure.

Also depicted are the rescue of a crew of a crashed aircraft and the discovery of an Antarctic oasis of bare ground and ice-free fresh water lakes atop a thermal bulge deep inland.

[1] The Secret Land won the Best Documentary Feature oscar at the 21st Academy Awards in 1948.