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The evidence of what went wrong was in the telemetry from the second the explosion occurred . 'Main B Bus undervolt' as reported by Jim Lovell was the first clue. So Fuel Cell B had a problem. Telemetry received at Houston confirmed it in more detail. Plus the pressure from the associated tanks were dropping rapidly and other hardware located next to it began to fail also. They were the first indicators of the cause.
Next was the paper-trail regarding the fuel cell's ground testing. It was discovered that a test had found a faulty component and a repair was ordered. This report was acted upon and temporary solutions were found with a ground based power supply. A full redesigned system was never followed up before launch; human error played a key role. The rest you know.
More detail in the revised book.
The evidence is for all to see; no mystery if one bothers to research it properly rather than guess and embarrass yourself as Marcus constantly does. He never admits he is wrong about anything and hope you never bother to research it yourself. All the conspiracy people are just the same to keep their fantasy going for as long as they can. They love to try to be famous for something even though they are supporting total nonsense!
This is the recovery helicopter for Apollo 8, 11 & 13... based in San Diego, California.
If you desire the full explanation of what happened and how the investigation was carried out in more detail than my book; this Haynes Manual is perfect. Conspiracy guys are far to lazy to bother.
One particular hoax supporter, Marcus Allen, points out that without the Command Service Module (CSM) in a laboratory, how could NASA possibly understand what caused the explosion that called off the Lunar Landing?
The mission was completely altered once an explosion took place and damaged major components that kept the astronauts alive in space. In chronological order, a ground controller asked to 'Stir the Oxygen tanks.' The fuel cells turned hydrogen and oxygen into electricity and produced drinking water too.
Both gasses were in a compressed liquid form. In the weightlessness of space, the liquids can become uneven in density as the gasses are used. So a fan was built in to enable them to be stirred and become even again for a smooth operation.
But a faulty wire component shorted during this action, overheated and ignited the Oxygen. But how was this discovered as this part of the spacecraft was never investigated by the astronauts themselves? It is claimed by Marcus that all the evidence was destroyed as it entered the atmosphere after separation four days later and the crew safely returned.