Why would "science" even set out to research the biblical flood?
The job of science is to seek explanations for things. With the flood there is no thing, just a story. May as well have science exhaustively search for Thor's hammer.
We read that God wants faith from us -- including to admit our wrongdoing in life and turn in faith to Christ for the forgiveness of all the wrongs we have done in life, to be 'born anew' -- an act of
faith.
Faith is...trusting in God -- that is, to trust in His message to us (through Christ),
without seeing conclusive proof ahead of time.
If there was proof ahead of time -- anything that proved God to be evidently and clearly real, then many would pragmatically turn to Christ in self-interest, even
without trusting God (or not fully trusting)....
So, 'faith' then is to trust
without such conclusive proofs ahead of time (like strong evidence of any miraculous event, or if the scripture had given an actual age of the Earth(!)....) , but to instead
trust in Christ's words.
He taught us such things as this:
34 “A new command I give you: Love one another. As I have loved you, so you must love one another. 35 By this everyone will know that you are my disciples, if you love one another.”
So, faith is like trust --
"Now faith is confidence in what we hope for and assurance about
what we do not see."
We see that God wants us to
trust in Him and Christ, not waiting for outright proof first.
So, therefore, any strong evidence that would just prove the Bible is correct, like finding strong evidence of a miraculous event or if the text of the Bible specified the age of the Earth in a precise way like if it contained something like:
'now the Earth was a thousand thousand thousand years old, and then God came and said let the waters separate and dry land appear'
(made up text, not in the bible)
or something like that, that would be a serious problem for what God wants from us! Because once scientific evidence was found that confirmed the text, the text would be obviously correctly saying something only science can find thousands of years before science found it....and
that would just outright prove the bible and God existing, and then the whole goal that many of us come to faith would be
precluded -- many would turn to repent and follow the Law
without trusting God at all in their hearts.
But in the long run, trusting God is very key, because otherwise we discount and pay less attention to more of the things Christ teaches that are for the best, like "love your enemy". Or maybe it's because over time, over vast time, only trust in God, alone, is really good enough: love and trust being what are in the best relationships.
So, we can expect that God would then prevent any kind of clear conclusive evidence from being available, in order that His goal for us to come to real faith -- full trust -- be possible. All evidence has to be withheld but for the Words from Christ.
Now, some Christians think the Flood story is entirely just a parable (it's a parable either way: if literal, or if just a teaching story), but what counts is whether they believe in Christ, listening to what He said.