The sense of this verse spoken by Jesus in the Olivet Discourse is that the unrighteous will be taken by complete surprise at the coming of Jesus.
“But as the days of Noah were, so also will the coming of the Son of Man be. For as in the days before the flood, they were eating and drinking, marrying and giving in marriage, until the day that Noah entered the ark, and did not know until the flood came and took them all away, so also will the coming of the Son of Man be” Matthew 24:37-39
Jesus also gave us this reference to Noah’s flood as a picture of His wrath to come. Noah’s flood was the first occasion when God poured out His wrath upon a wicked and unrepentant world. Sadly, because of acceptance of evolution, the world does not believe Noah’s worldwide flood, and yet it is the only historical account that provides the best explanation for the geology and geomorphology that we see in the world today.
“Then the Lord saw that the wickedness of man was great in the earth, and that every intent of the thoughts of his heart was only evil continually. And the Lord was sorry that He had made man on the earth, and He was grieved in His heart. So the Lord said, ‘I will destroy man whom I have created from the face of the earth, both man and beast, creeping thing and birds of the air, for I am sorry that I have made them.’ But Noah found grace in the eyes of the Lord.” Genesis 6:5-8
The reason for His wrath being poured out in Noah’s day is that the hearts of the unrighteous conceived evil continually. Therefore, if Jesus words are to be believed, this will also be the state of the earth at His Second Coming.
The prophet Daniel also talks of the growth of evil in men’s hearts in the last days.
“And in the latter time of their kingdom, When the transgressors have reached their fullness (when their sin are coming to the full), A king (Antichrist) shall arise, Having fierce features, Who understands sinister schemes. His power shall be mighty, but not by his own power; He shall destroy fearfully, And shall prosper and thrive; He shall destroy the mighty, and also the holy people. “Through his cunning He shall cause deceit to prosper under his rule; And he shall exalt himself in his heart. He shall destroy many in their prosperity. He shall even rise against the Prince of princes; But he shall be broken without human means (on Jesus return with the Saints).” Daniel 8:23-25
Note the Antichrist arises when the sins of his followers “have reached their fullness”.
Johan Huibers’s replica of Noah’s Ark is 130 metres long, 29 metres wide and 23 metres tall.