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The first is triggered by a Main Bus B undervolt, caused by the rupture of the tank containing oxygen which reacts with hydrogen to produce electricity. The second alarm is triggered when Main Bus A suffers the same problem. A third alarm is triggered by high levels of carbon dioxide, caused by the Lunar Module's inability to filter enough air for all three men for as long as it was being made to.

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Q: What caused the master alarm to go off in the movie Apollo 13?
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