If we maintain some awareness in these deeps of the mind, it is somewhat like snorkelling in deep sea; we realise what immense and unbelievable depths lie beneath us. Dreams often portray this as depth—a hole, deep water, a chasm; space; our non-verbal life in the womb, or early childhood, which is remembered as patterns of feeling reaction rather than verbal utterance. In the depths we may find gems, skeletons, archaeological objects, and these relate to the memory of our evolutionary past, family influences we carry within us unknown. Deep cuts: suggests a hurt which penetrates us; or emotions which affect us powerfully. Idioms: in deep water, in the deep end; deeply troubled; deeply hurt. [1]
1- When we dream of the deep we are usually considering past family influences of which we mav not be consciously mindful.
2- We may be trying to understand archetypal patterns which have not been recognisable in the past.
There may be information available to us which we can only understand through being able to appreciate our own emotions.
3- The Unknown, and therefore the unfathomable, is often symbolised by depth in some way - deep water, deep underground etc. [2]
This can be accompanied by feelings of discovery or dread. “Deep” is also found in a number of interesting idioms, such as at the “deep end” or in “deep water.” One can be deeply hurt or deeply troubled. [3]
The deeper you go, the more profound the pain and the gain. [5]