If we are to explain consciousness, at some point our explanation must come to: ...thus X happens and, as you can now see, this gives rise to full consciousness. The question this text answers is: What is it you must see? (as well as: what is X?) The answer is provided in the form of eighteen steps that analyse, reverse-engineer, and reconstruct the phenomena that constitute consciousness. As the title suggests, the text digs as deep as the quantum level. (In this 2025 updated edition the text starts with a bonus first chapter on why today's LLM AIs cannot be conscious) Preamble B: It is ultimately an aggregation of these content/perceiving pairings that constitutes the totality of our conscious awareness. Which is to say that any other aspect of our brain's conscious processes: the focussing of attention, acts of will, or anger, greed and so on must either be incorporated into the scheme as content/perceiving pairings themselves, or be explicable in terms of some arrangement of content/perceiving pairings. Which is to say, there is nothing in our consciousness beyond these content/perceiving pairings, so every conscious experience must be capable of expression in terms of some or other or set of content/perceiving pairings. Idea: Perceptions belong to the brain, are generated by the brain, are private to the brain, exist only within the brain, and do not extend into the external world beyond our bodies. Elaboration: The sky is not blue. Rather: photons of light of certain frequencies arrive on the backs of our eyes from the atmosphere. Light receptor cells in our eyes then send electro-chemical signals into the brain, and the brain generates the sensation of some or other colour in response to the electro-chemical signals. Our perceptions are generated by our brains; we do not swim in a sea of perceptions picking up those useful to us as we pass through them (or them through us). Corollary: At first blush, the perceptions described here accord with the philosophical concept of Secondary Qualities.