How to use "deeper" in a sentence

Suddenly the sky was shattered by lightning, then by a hard clap of thunder, and the night imploded into a deeper darkness, into infinite and perfect blackness.

She thought of the man in her nightmare, the man in black whose face had been lumpy with maggots, and the shadows in the corner of her office seemed darker and deeper than they had been a moment ago.

The furrows in Elliot's brow grew deeper

And even if he was deeper under than I thought, some of his people probably went in there and pulled him out while I was rushing off to you

The deeper reaches of the mountains