The deep places of the sea (Exodus 15:5,Exodus 15:8;
Psalms 78:15), an underground spring (Deuteronomy 8:7;
Proverbs 8:24), the earth's interior (Psalms 95:4;
Isaiah 44:23), and by extension Sheol, the subterranean abode of the dead (Psalms 63:9;
Psalms 71:20). “The depths” is used figuratively for the unsearchable (Proverbs 25:3), for the womb (Psalms 139:15), and perhaps for tragedy (Psalms 130:1). In creation water covered the chaotic depths of the earth (Genesis 1:2, where “deep” combines the physical meaning of lowest places on earth and earth's interior with the emotional meanings of the dark abode of the dead and the uncharted, feared depths of the oceans. The biblical message is that the sovereign God controls the fearsome, mysterious, tragic, and unknown elements of human existence and that even these inanimate aspects of existence can be called on to praise Him.
These dictionary topics are from the Holman Bible Dictionary, published by Broadman & Holman, 1991. All rights reserved. Used by permission of Broadman & Holman.
Butler, Trent C. Editor.. "Entry for 'DEPTHS'". "Holman Bible Dictionary".