Dreaming of the deep abyss reflects the vast emotional unconscious part of the dreamers personality. Such a vast unexplored part that can be scary and empty, yet contains a hidden mystery of what is going on. What is found or seen are clues that becomes a metaphorical message to the dreamer.
This is a dream of obstacles and difficulties.
To dream of this bottomless pit suggest drastic fall in business, career or calling.
To fall into one in the dream suggest disaster, dark life, and strong warning to be extremely careful in business dealings.
To look or almost fall into one, suggests warning not to be swallowed by an approaching problem or temptation.
If you avoid the fall in the dream it suggests you will overcome difficulties, but you need to apply caution in whatever you do at this material time.