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Conspiracies
(lemmy.ml)
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“Half a century” is the big challenge in that sentence. The Manhattan project started in 42 and Japan was bombed in 45.
They also had near slips with the press and foreign espionage happening within the project. That would’ve been real tough to keep secret from the public for decades.
The challenges can be overcome with sufficient money. If the secret keepers are convinced they are keeping quiet for the public good then there is very little resistance.