Rashi explains that, indeed, Hashem had a wealth of ways to save Noach. The Teivah, Ark, was not for Noach; rather, Noach worked for one hundred and twenty years building this incredibly large boat, so that the curious spectators would question Noach, who would impart the message of impending doom. Perhaps this would motivate them to repent. In other words, the sole purpose of the Ark was to inspire the people to do teshuvah, repent. Hashem’s boundless compassion for His creations is so great that He held off the punishment which they certainly deserved, just because they might repent. We…