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Did you forget about “the fountains of the great deep?”
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That was probably part of it. I understand there still may be a lot of “great deep” left.
BTW, I saw the Ark Encounter a couple of weeks ago. It was much more than I expected. It was really good.
I actually read this book back in 1984 or so:
http://www.creationism.org/patten/PattenBiblFlood/
I talked with the author. He said he changed his opinion since he wrote the book regarding what large planet probably came nearby.