Gudako:
1: My Lord, what precisely is
the Abyss (深淵,
Shinen?)?
2: Is there actually something further down than the Underworld?
Gilgamesh:
There is. The World of Mesopotamia comprises of Heaven and Earth. That which here lies below the Earth known as the Underworld -- and deeper still there rests the Abyss.
The Abyss is an
Ocean of Void (無の海,
Mu no Umi?). It is from those dark waters that the God Apsu and the Goddess Tiamat manifested, crafting the World of Mesopotamia.
If it must be described, it is
the Sea of Dawn (黎明の海,
Reimei no Umi?), which existed before the creation of life.
Being that the God Enki has at present vacated his posting as the Administrator of the Abyss, were one to plunge into it now, there would be no returning.
Mashu:
It's the place where Lord Gilgamesh sought
the Herb of Immortality (不老不死の霊草,
Furou-Fushi no Reisou?), isn't it?