It's very reminiscent of Slavomir Rawicz's story, which has since been debunked somewhat. However, it seems that more than one escapee has related similar encounters.
The Rawicz thread is
here.
They've made a film of it already.
http://www.imdb.com/title/tt1023114/
No yeti in it though.
There has always, I gather, been a lot of doubt about the veracity of Rawicz’s story in
The Long Walk – ever since its publication in the 1950s; with an increasing amount of increasingly convincing debunking, over the decades since – though it’s reckoned within the bounds of possibility that somebody may truly have accomplished this feat or one much like it (as told of in the above quoted post, and the Rawicz thread linked-to therein).
The original book was co-written by Slawomir Rawicz and the British journalist Ronald Downing – it is suspected that Downing in fact performed the function of “ghost-writer” for the book. An interesting suggestion has been floated, that re the yeti-encounter element, there was something of a case of “the tail wagging the dog”: Downing, prompted to follow up yeti material in response to the widespread fascination in Britain in the ‘fifties, with the putative Himalayan creature, was contacted by Rawicz initially over the Pole’s supposed encounter with a yeti twosome during his supposed odyssey. It was subsequent to that, that Rawicz told Downing his full Siberia-to-India tale – whence the idea of the book and seeking publication.
Downing’s role as above, and other matters, discussed in a piece on Cryptomundo by Loren Coleman in 2010. Attempting a link:
cryptomundo.com/cryptozoo-news/long-walk/
I’m not very “handy” with links: if it doesn’t work, I suggest logging onto Cryptomundo and using the search function, keyword “yetis”: should lead quite easily to the Coleman piece, dated Dec. 15th 2010 and titled “
The Way Back: Will Yetis Be Scene Stealers?” This in reference to the film, as re quote above (film then shortly to be released) -- and as
oldrover mentions there, the yeti episode was in fact not included in the film.