Dreams about descending into a basement are connected to our unconsciousness. The floors in a house represent our psyche/mind and when you head to the basement you are entering a world of hidden motives, shadow, instincts, repressed memories and experiences. This is the unknown part of the dreamer, the part that is one level below the consciousness. According to Jung this is the place where you lose your soul and rediscover it. The darkest parts that we represses within our self are found in the basement. It is important to write down as much information as much as possible as all the symbols in them connect the meaning behind this powerful dream.