Isn’t it amazing that Noah had the use of a saw mill using a circular rotating blade way back then.
Note the slightly radiused, repeating striations along the side of that “beam”.
Common use of the circular saw mill began here in America, as best I recall, sometime around the mid 1800s; before that they used a reciprocating (up and down) band saw, either human (for small ones) or water - wheel powered.
If you have an old house with exposed beams, look on their sides; it there are parallel straight ridges and grooves, then it was whip-sawed and the house is probably 100 to a couple of hundred years old or so. Of course modern “portable” saw mills use a band-saw system and the “Alaska” saw uses a sliding chain saw. You can usually tell the difference if you are familiar with lumber.
Hand hewn beams have a unique, uneven rustic look with up and down cuts every 8 or 10 inches or so from the “felling axe”. If in a settled area, it is probably at least 200 years old, or built from materials from a pre existing structure.
Before about 1820, most beams were hand hewn using various forms of axes and adzes. Even through the 19th Century a lot of country folk were still doing it that way. See “Foxfire Books” for details.
I have no idea how those beams got up there, but I seriously doubt that they floated, nor are much more than about 100 years old.
“Isn’t it amazing that Noah had the use of a saw mill using a circular rotating blade way back then.”
You got all that from some grainy video? You should work for NCIS.
Technologies come and go: The ancient Romans had cement, but the “recipe” was lost until we rediscovered how to make it in the 19th Century, IIRC.