Its ships, which once dominated the seas, are going to come back and see how the city has been destroyed.
Tyre once dominated trade on the ocean, but now the ocean will say to it that, unlike God, it (the ocean) never begat or raised any children.
Egypt will be disheartened by all the nasty stuff that happened to Tyre.
Isaiah gloats a little over how the city got wasted. He says they should make sure that God's responsible.
They can't even escape by going to the isle of Cyprus (nice try, Tyre).
He says the Chaldeans destroyed Tyre and tore down its towers.
Tyre will be forgotten for seventy years.
But then, like a forlorn prostitute, Tyre will wander around singing songs about how it wishes people remembered to pay attention to it.
God will make sure Tyre returns to her trade, like a prostitute restored to business. This time, though, it'll all be for God's greater glory. Tyre's merchandise will help people who are devoted to God.