Exodus 15:5 KJV

The depths have covered them: they sank into the bottom as a stone.
Exodus 15:5, King James Version

In context

4 Pharaoh’s chariots and his host hath he cast into the sea: his chosen captains also are drowned in the Red sea.

5 The depths have covered them: they sank into the bottom as a stone.

6 Thy right hand, O Lord, is become glorious in power: thy right hand, O Lord, hath dashed in pieces the enemy.