CONVENTIONS AND UNITS. DIVING HISTORY. PART 1: EARTH ATMOSPHERE, TERRASPHERE, AND HYDROSPHERE. PART 2: PRESSURE, DENSITY, AND BUBBLES. PART 3: GAS KINETICS AND PHASE TRANSFER. PART 4: COMPUTING AND DIVING ALGORITHMS. PART 5: STATISTICS, RISK, COMPARATIVE PROFILES, AND MALADIES. APPENDIX A: FUNDAMENTAL CONCEPTS AND RELATIONSHIPS. APPENDIX B: DIVEWARE AND PLANNING. REFERENCES.