After a month with Osman Bator, the Mackiernan party embarked on a difficult journey by horseback and camel across 1,000 miles of Taklimakan desert, traveling south-southwest by night towards the Himalayas. Mackiernan carefully recorded positions and landmarks, and radioed their progress to Washington. Records of the radio transcripts have not been released by the CIA or State Department. Mackiernan's log, with additions by Bessac after Mackiernan's death, was declassified in the 1990s, though some alleged that the document had been heavily doctored. By late November, the party reached the 10,000 ft foothills of the Kunlun Mountains, where they spent the winter with Hussein Taiji of the Kazakhs.