from wiki:
Because he contrived "to make his throne higher than the clouds over the earth and resemble 'My power' on high", Satan-Sataniel was hurled down, with his hosts of angels, and since then he has been flying in the air continually above the abyss
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abyss: 1350–1400; earlier abisse, ME abissus < LL abyssus < Gk ábyssos bottomless, equiv. to a- a- 6 + byssós bottom of the sea
If 'abyss' is actually referring to ' the infinite deep' or is an illusion to the oceans as a "bottomless pit"...is this why we have so many fish icons associated with religions?
Could it be that the earth itself is actually the Great Abyss?