The depths have covered them,.... The depths of the sea covered Pharaoh and his host, so as to be seen no more; and in like manner will mystical Babylon, or antichrist, be destroyed, and be no more found and seen; as likewise the sins of God's people, being cast into the depths of the sea, and covered with the blood of Christ, will be seen no more; when they are sought for, they shall not be found:
they sunk into the bottom as a stone; into the bottom of the sea, as a stone thrown into anybody of water sinks and rises not up again; this circumstance is observed by Nehemiah 9:11
their persecutors thou threwest into the deep, as a stone into the mighty waters; and thus a stone like a millstone being taken by an angel and cast into the sea, is made an emblem of the irrecoverable ruin and destruction of Babylon, or antichrist, Revelation 18:21.