Cuban Missile Crisis WI

During the build up of Soviet forces in Cuba, the merchant ship Indigirka, carrying SS-4 nuclear warheads, catches fire (engine room fire) off the coast of Scotland. What happens if the crew is unable to stop the fires and are forced to abandon ship?
 
Paranoid KGB types assume the CIA, MI6, etc is responsible and act on that assumption.
I'm sure there are several political officers aboard that will refuse to abandon ship untill it is burned to the waterline.
 
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