Tehom

Tehom (), literally the Deep or Abyss (), refers to the Great Deep of the primordial waters of creation in the Bible.
Origins.
Tehom is a cognate of the Akkadian word "tamtu" and Ugaritic "t-h-m" which have similar meaning. As such it was equated with the earlier Sumerian Tiamat. In Modern Arabic, Tihamah refers to a coastal plain of the Red Sea.
Robert R. Stieglitz stated that Eblaitic texts demonstrate the equation of the goddess Berouth in the mythology of Sanchuniathon with Ugaritic thmt and Akkadian Tiâmat, via the name "bʾrôt" ("fountains").
Assyriologist Heinrich Zimmern writes in his comparative study of Babylonian and Hebrew creation myths:
However, the word is also used in the plural ("tehomot"), suggesting that in the Bible it refers to a geographical feature which could occur in multiple places, rather than a single being.
Genesis.
Tehom is mentioned in Genesis , where it is translated as "deep": 
The same word is used for the origin of Noah's flood in :
Gnosticism.
Gnostics used this text to propose that the original creator god, called the "Pléroma" or "Bythós" (from the Greek, meaning "Deep") pre-existed Elohim, and gave rise to such later divinities and spirits by way of emanations, progressively more distant and removed from the original form.
Kaballah.
Tehom is also mentioned as the first of seven "Infernal Habitations" that correspond to the ten Qliphoth (literally "peels") of Jewish Kabbalistic tradition, often in place of Sheol.