Prove to me that it happened, and maybe you can save my ’soul’.

Referencing the bible does not count, I don’t accept accounts, I want hard evidence that isn’t open to interpretation.

What I want from you people, if I am to believe you, is a scientific argument that starts in the following way:

“Suppose that there wasn’t a great flood as portrayed in the bible.”
Now I want you to find contradictions to this supposition, thus concluding that there was a great flood as portrayed in the bible.

This means of proof will force you to encounter hard science which, as I challenge, will make it impossible to find contradictions to the supposition.
Now I don’t want to see anything which is psudo-scientific, for example Radio Carbon Dating is accurate and I will not accept anything which includes alternatives to it.