To know what it's really like, as opposed to what movies depict, just read the transcript of the famous Apollo 13 incident. Remember the movie version? Read what they <i>really</i> said here (<a href="http://apollo13.spacelog.org/page/02:07:55:19/" rel="nofollow">http://apollo13.spacelog.org/page/02:07:55:19/</a>). For instance:<p><i>Okay. And we're looking at our S—SERVICE MODULE RCS HELIUM 1. We have—B is barber poled and D is barber poled, HELIUM 2, D is barber pole, and SECONDARY PROPELLANTS, I have A and C barber pole. BMAG temperatures?</i><p>Less dramatic than in the movies. A lot more engineering and detail-oriented.