How does Edgar Allan Poe use imagery in MS. Found in a Bottle?

Imagery:

At times we gasped for breath at an elevation beyond the Albatross—at times became dizzy with the velocity of our descent into some watery hell, where the air grew stagnant, and no sound disturbed the slumbers of the Kraken.

She rose up, like a demon of the deep, slowly from the dim and horrible gulf beyond her.

All in the immediate vicinity of the ship is the blackness of eternal night, and a chaos of foamless water.