NET

21 Then one powerful angel picked up a stone like a huge millstone, threw it into the sea, and said, “With this kind of sudden violent force Babylon the great city will be thrown down and it will never be found again!

Darby

21 And a strong angel took up a stone, as a great millstone, and cast [it] into the sea, saying, Thus with violence shall Babylon the great city be cast down, and shall be found no more at all;

KJV

21 And a mighty angel took up a stone like a great millstone, and cast [it] into the sea, saying, Thus with violence shall that great city Babylon be thrown down, and shall be found no more at all.