Even after God had resolved upon the destruction of the sinners, He still permitted His mercy to prevail, in that He sent Noah unto them, who exhorted them for one hundred and twenty years to amend their ways, always holding the flood over them as a threat. As for them, they but derided him. When they saw him occupying himself with the building of the ark, they asked, "Wherefore this ark?"
The sinners: "What sort of flood? If He sends a fire flood, against that we know how to protect ourselves. If it is a flood of waters, then, if the waters bubble up from the earth, we will cover them with iron rods, and if they descend from above, we know a remedy against that, too."