Noah certainly didn’t build the arc by himself. He was a King or a religious leader who could command thousands of workers.
Can't take Noah's story literally. You have to look at it as a theological allegory with a deeper spiritual meaning. The only thing we know that is true is the flood story because every civilization (in the known world) had to deal with a "great flood".
What we actually know about ancient civilizations can be determined by the Biblee. Anything before that, it seems there is a lot of guesswork being done.
“Can’t take Noah’s story literally.”
I don’t.
What I take away from the story is that their was a massive world wide flood and a near extinction event. It also implies that their was some form of civilization that was wiped out.
The comet research group has been investigating a potential comet impact ~ 12k years ago. Gramm Hancock has grifted off their work but buy are legitimate scientists.
“How long can you tread water?”