The basis for the event may be supernatural, but the event itself (the Ark, the flood) should have material evidence, if they did occur.
This inability to prove a supernatural event with material evidence is not, however, proof that the event is a myth that did not occur.
You're the one claiming these events occurred. I'm simply asking for proof.
Perhaps. But since natural laws were not in operation when the events occured, why do you assume the material evidence has to conform to natural law, and that evidence of the event is thus amenable to investigation by scientific means? Uniformity of physical laws does not apply, by definition.