The mountains were covered in 15 cubits of water (i.e. tops of the high mountains were 6.9 meters beneath the surface of the water).
To be fair, I read it the same way Faith does - that the water rose 15 cubits, i.e. the total depth of water was 15 cubits.
I live at the bottom of an ancient lake (now dried up for our convenience) and it is
very flat. Fifteen cubits of water would cover everything as far as the eye could see, barring human constructions. (Tower of Babel, anyone?
)
It could easily be miscontrued as a "worldwide" flood.
Of course, the idea of mountains rising after the flood is utterly unscriptural.
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