We can think of our unconscious like a deep pond. The surface of the pond is visible to our conscious self and we can interact with it by swimming, fishing, or wading. We have little awareness of what lies hidden at the bottom of the pond. Things of a higher vibration, such as a leaf or a feather, float on the surface of the pond, but things of a lower vibration, like a rock, sink to the bottom of the pond. However, even the feather and the leaf may eventually sink to the bottom of the pond over time.
Our happy experiences and memories are of a higher vibration because they are filled with love and can float on the surface of our consciousness. On the other hand, our unhappy experiences and memories are of a lower vibration because they are filled with fear. These fearful memories and experiences sink to the bottom of the depths of our unconscious, our lower astral plane. Just as the bottom of a pond is murky and obscured so is our deepest unconscious. To clear our old feelings of fear, guilt and shame we must enter the water of our unconscious to rescue these portions of our psyche that are trapped there.