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An oxygen cylinder exploded in Apollo 13, blowing a side of it.

The Apollo 13 service module experienced an explosion of the oxygen tank 2 about 200,000 miles from earth. Some people think the explosion happened because the O2 tank was dropped, which broke the internal filler tube, but the real reason for the explosion was pure stupidity.

The real reason for the Apollo 13 oxygen tank explosion was due to Beach Aerospace not upgrading the O2 tank thermostat from a 28v system to a 65v system. After the investigation it was discovered that Beech Aerospace never bothered to read the new specs for the Apollo spacecraft, that required an increased voltage system from a standard military 28v system to a 65v system. As soon as the electronics were started for Apollo 13 on the pad, the thermostat fused together allowing the O2 tank pressure to build, the internal tank temp shot up to 1,000f degrees, but the temp gauge in the spacecraft only went up to 85 degrees F, so the crew didn't know there was a problem until the O2 tank was stirred, thereby exploding and disabling the entire service module.

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Q: What was it that actually exploded on board of Apollo 13 that blew out the side of the module?
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