The abyss has covered them. They descended into the depths like a stone.
The depths have covered them: They sank into the bottom as a stone.
The floods cover them; they sank in the depths [clad in mail] like a stone.
The deeps cover them: They went down into the depths like a stone.
The deep sea covered them; they sank into the deep waters like a stone.
The depths have covered them, they are sunk to the bottom like a stone.