The water didn't come from space. It came from the water that was evidently around the earth. It didn't fly in from outer space, so to speak. You still didn't answer. Whether it's special pleading or not, I'm giving you my viewpoint as to why I do not consider it impossible both in generic terms and in extraordinary terms for the flood to have happened as recorded. You are more scientifically educated than I am, but that does not mean I can't question you or that I have to believe everything you and others say. On the other hand, do I believe what the Bible says? Yes. Do I believe everything it says, even if I can't explain everything? Yes. Do I also believe that things are happening that are beyond mankind's control? Yes, indeed. And do I believe these things are in harmony with what the Bible says? Yes again.
(Luke `17:26,27
Just as it was in the days of Noah, so also will it be in the days of the Son of Man: 27People were eating and drinking, marrying and being given in marriage, up to the day Noah entered the ark. Then the flood came and destroyed them all.…")
Scientists themselves are hypothesizing that mankind is at odds with itself. Both in an evolutionary fashion (destructiveness) and a moral way (selfishness, greediness). Yet some things go on as normal. Eating, drinking, going to work, lawsuits, taking care of animals sometimes, BUT -- many many bad things are happening. And scientists say that the earth may not recover from the destructiveness of men--not of animals. So yes, I believe that the Bible is telling the truth.