Crazy Ivan was a maneuver used by Soviet submarines to clear their baffles in order to see if they were being followed. The sudden, unexpected nature of the maneuver led to the term being used in the English-speaking world.
The term Crazy Ivan has sometimes separately been used to describe the possibility of a rogue Soviet leader committing to military action, typically in reference to a limited launch of ICBMs against the US, originating from the Tom Clancy novel The Hunt for Red October.
- Kilian, Michael (23 July 1997). "For Nuclear Subs And Their Crews, The Cold War Is Far From Over". Chicago Tribune. Retrieved 11 August 2017.
- Evans, Dave (28 May 1991). "Crazy Ivan keeps missile afloat". Chicago Tribune. Retrieved 16 September 2015.
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