SR
Slavomir Rawicz
Sławomir Rawicz was a Polish Army lieutenant who was imprisoned by the NKVD after the Soviet invasion of Poland. In a ghost-written book called The Long Walk, he claimed that in 1941 he and six others had escaped from a Siberian Gulag camp and begun a long journey south on foot, supposedly travelling through the Gobi Desert, Tibet, and the Himalayas before finally reaching India in the winter of 1942.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The long walk
1956
ISBN 9780094743403