Well, since we're piling on.
Paleontologists have discovered thousands of human dna samples from remains of varying levels of preservation that are dated 5000 or more years old. They have confirmed what fossils had already evidenced quite a long time ago- that human beings have remained almost entirely unchanged since WELL before the creationist (including WT, who misdefines creationism to disinclude themselves) chronology for when the flood supposedly occured. Ergo, absolutely no genetic explanation for why human lifespans before and just after the supposed flood were so much longer than contemporary humans. No record of humans becoming less and less resemblant of their perfect origins as the centuries roll on. While we're at it- not even a single fossil of a human being anywhere in the world that would be large enough to be considered a Nephilim.
Some here have pondered over how we could actually believe this stuff. I can speak for myself when I say I had some creative, and varyingly plausible explanations for why science didnt confirm any aspect of the flood account.
1) The chronology was wrong. The flood chronology, like much of Biblical chronology, follows a piecing together of the lifespans of patriarchs and kings who were recorded in the Bible's detailed geneologies. However, throughout the Bible, we quite often see the words father and son refer to relatives much more distant in ancestry. I reasoned that many generations could have been skipped at certain points, leaving room for the possibility that the flood happened much farther in the past.
2) The flood was not purported to be a natural event. It's purported to be a miracle. If it really was a miracle, then Jehovah had the limitless ability to make the result exactly how he willed the result , even if that result was nothing like we would expect in absense of divine intervention. To project naturalistic results from a miraculous event begins with a false premise and is therefore a strawman argument.
I'm not saying they're necessarily good rationalizations, but I think that they are better than anything WT ever printed. Which is a pretty sad pattern I've been noticing lately in reexamining why I believed for so long. Little old not-annointed and unassuming me always had better explanations than holy spirit ever gave the GB. Even when mine were wrong, their were always wronger.