You might remember the 1957 film Yangtze Incident, starring Richard Todd, all about a Royal Navy vessel, trapped by communist forces deep inside China in 1949.
Well, it was based upon real events.
And if you think the film was dramatic, then it is not a patch on real life.
This is the real story of HMS Amethyst, her crew and a cat called Simon, in the Yangtze incident 1949.