It's not so simple. A LOT of engineers worked on the technology. Let's assume it was all a hoax and most of the engineers didn't know it.
The thing is, even if an engineer was working on a small part, that engineer expected the part to be going into space. It was designed to go into space, from the smallest part to the integration. And they didn't just design on paper - they build parts and prototypes and tested them to make sure they could go into space. And some pieces were designed to be on the moon. (Parts of the lunar lander structure were designed for 1/6 gravity.) And not only that, but they expected this ship to be carry people, so they designed it to protect people in the space environment. That added several systems for life support (breathing, food, waste disposal) that engineers really designed, tested and built. The designs were for taking people into space and to the moon.
And we do have the blueprints and some remaining parts. Engineers today can verify that, as designed, it had the specifications for taking people into space and to the moon. If any of this were not up to specification, a lot of engineers would have noticed in the last 50+ years. That hasn't been the case. (And there are engineers outside the US.)
So you're left with nearly all the engineers spending their time designing, building and testing something that could go to the moon (so the blueprints and remaining parts look right), but then building something else that couldn't.
If this was all a hoax, it would have been simpler to just, you know, go to the moon.
You're missing the point.
Did 1,000s of engineers build a working lunar shuttle? Yes.
Did 1,000s of engineers design all kinds of systems
that met specifications they were given for working on the moon? Yes.
Did 1,000s of engineers design all kinds of astronaut clothing
that met specifications they were given so that men could survive on the moon? Yes.
Did 1,000s of engineers understand/test
the specifications they were given? No.
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The top scientists at NASA are the ones who calculated the "big picture" of what it would take to launch, land, survive and return from the moon. These specifications were then funneled down to the 1,000s of engineers who built all the moon stuff. The 1,000s of engineers relied on the specs they were given, or at least they relied on the
underlying assumptions..
As the old comparison goes, going to the moon
IS actual rocket science, so this type of engineering is highly complex. Most engineers can't comprehend it and aren't trained to. You can't go to your local college and major in rocket science. Only those highly trained genius scientists "at the top" understood it and were tasked with putting together the overall plan. It would've only taken a few engineers to convince everyone else that "this will work".
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Think about all the manpower and people it takes to build a skyscraper. Yet how many architects actually draw up the plans for the design? Less than 5? Then add a few more people to account for the head construction engineers (who have some engineering experience). Everyone else has NO IDEA how to build a building. They are experts on the detailed process, not the overall build. So out of 1,000s of concrete guys, plumbers, electricians, steel workers, etc, etc who build buildings, less than 10 people are responsible for the design and structural integrity of the building.
And this is for a building project that has been done 1,000s of times. There are skyscrapers everywhere.
.
How fewer people would
completely understand what it would take to go to the moon for the first time? How many engineers could look at all the calculations of astro-physics, math and engineering and
completely understand it enough to point out a problem with the theoretical concepts and assumptions of the overall plan?
A handful. Everyone else, 99% of the people working on the project, had to trust the underlying assumptions and theory
because they weren't experts. .
NASA may very well have had the capability to land on the moon, but they did not. The evidence proves otherwise. Did 1,000s of engineers build what they THOUGHT was moon-capable equipment? Yes. Was it actually capable of fulfilling the project? We'll never know.
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It's easily explained how 1,000s of people can be misled to believe a lie and to be part of a big hoax. It all starts with a false premise or a false set of facts. Any conclusion, no matter how logical, is false if the starting premise is wrong.
Could a handful of people have orchestrated all of these constructions projects and fooled 1,000s of engineers to build equipment that they thought would work? Quite easily.