When Petty Officer Jones is describing a "Crazy Ivan" he incorrectly mentions that the sub stops. First off, during a Crazy Ivan a Soviet sub will alter course 180 degrees, (turning completely around and begin traveling in the direction from which it came). US subs and Soviet subs operate at different depths. The follow sub never comes to a stop -- you would loose all navigation ability!
Actually, the officer in the movie is correct. At times, Soviet subs using a "Crazy Ivan" would stop their engines and pumps for maximum silence. The biggest risk wasn't lack of navigation but collision of which there is an official one on record: June 20, 1970 between the USS Tautog and and a Soviet Echo-class sub. See this link for more info/verification:
http://www.wordiq.com/definition/Crazy_Ivan
P.S. Some trivia. The pilot episode of the now-defunct science fiction series "Firefly" had the "Serenity" (the name of the ship on which the main characters were the crew) pull a Crazy Ivan. While there were similiarities, it wasn't a real "Crazy Ivan". This one was comprised of a complete stop, engine exhaust pods reversed, a fuel dump, a rapid re-ignition and then they put the metal to the pedal which ignited the fuel. Because they floored it they were not caught in the resulting fireball/smokecloud. The Reaver ship chasing them was unable to compensate in time and to avoid heavy damage had to compensate with evasive maneuvers allowing the Serenity to get away. Again not a real "Crazy Ivan" and remember this was a science fiction series, emphasis on the fiction. But it a was a damn cool scene... Also an episode of the science fiction series "Andromeda" also used the maneuver and was a little closer to the real thing. Kevin Sorbo's character, Capt. Dylan Hunt, made reference to it as an ancient mariner maneuver that they were attempting a variaton of. (Again it is a science fiction series...)
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