Con-Sonar: CRAZY IVAN! In the movie The Hunt For Red October the Russian submarine captains use a technique called a Crazy Ivan by the Americans. Basically every once and a while the Russian captains will make the submarine do a complete circle, startling any potential followers behind them. Unless the other submarine is extremely careful, the Crazy Ivan is meant to detect them since it will likely catch them by surprise. I have a similar technique I use for keeping safe while traveling, in that every so often, usually every few minutes, I do a full scan of everything and everyone around me. ...