Also see definition of "Beneath" in Word Study
Beneath
BENEATH [isbe]
BENEATH - be-neth': The adverb for "under" (kato). In Jn 8:23, the words "ye are from beneath," suggest hell in contrast to heaven. But the succeeding clause, "ye are of this world," gives the key for the interpretation. Earth, not hell, is expressed, although "that more awful meaning surely is not excluded" (Alford).
Also see definition of "Beneath" in Word Study