Ezekiel 26:19

‘For thus says the Lord Yahweh, “When I make you a desolate city like the cities which are not inhabited, when I bring up the deep on you, and the great waters cover you, then will I bring you down with those who descend to the pit, to the people of old time, and will make you to dwell in the nether parts of the earth, in the places that are desolate of old, with those who go down to the pit, so that you will not be not inhabited or be given beauty by me in the land of the living. I will make you terrors (a dreadful warning to men), and you will be no more Though you are sought for, you will never be found again, says the Lord Yahweh.” '

Tyre's final end is portrayed. She will become a city of the dead, at the hands of those who invade her, who will sweep in like the sea and cover her with their great waves. Her people will become like those who have died long ago, sharing their grave with them, desolate like they are desolate. She will be without living inhabitants, and can expect to be given no beauty by God as would be if she were inhabited by living men. Rather she will be a dreadful portent and warning because she is no more, gone to the land from which no one returns. And though men seek her she will be a lost city, never to be found again as a living city, hidden beneath the waves. The picture given is of the shadowy underworld where all that has ceased to be has gone.

Thus will this pearl of the sea, this mighty shipping nation, finally cease to exist, as a punishment for how she has behaved towards Israel. And it did inexorably happen, bit by bit over many centuries, until through time the island city was no more.