[TXnMA]

"That was 15 cubits above the highest landforms, not a mean depth."

Ah: "prevailed"...

So, if Everest existed then, the worldwide depth of the water at today's MSL would be 29,000 feet plus 22.5 feet = 29,022.5 feet...

IOW, ~5.5 miles of water covering the entire globe...

And the depth of the water in the mariana trench would have been over 12.25 miles...

[aruanan]

So, if Everest existed then, the worldwide depth of the water at today's MSL would be 29,000 feet plus 22.5 feet = 29,022.5 feet...

Well, since there's not this much water available, the conclusions would be, given a flood, that a. it wasn't a universal flood or, b. Mount Everest and other extremely high ranges didn't exist then. If b., then the event happened longer ago than anybody believes to be possible or that such high mountains appeared more recently and under conditions more weird than anybody believes to be possible.

[MrB]

did the mariana trench exist pre-flood or during?

What would happen if the ocean floors were to be upheaved to our present sea level?

If there was only one supercontinent, why would one assume Everest OR the Mariana trench, either one, would exist?

[Secret Agent Man]

You are assuming that Everest existed then. When the ‘fountains of the deep broke open, you are talking massive fault line earthquakes and tectonic upheaval, with certain plates sinking, and certain plates rising, crashing together, and forming mountains.

If Everest did exist before the flood, then yes it was covered. If not, it was created during settling and tectonic instabilities during or after the flood.