Unconscious mind: makes up most of the mind and is below the surface of awareness, a vast storehouse of biological drives and instincts that has an impact on our behaviour and personality. Eros/ Thanatos are there, etc innate drives. It contains traumatic memories as well as the primitive desires and impulses that have been repressed. These memories may cause distress and so the mind uses the defence mechanisms to lock them away and prevent the person being aware of them.