The following index is provided as an overview of and topical guide to underwater diving:
Underwater diving can be described as all of the following:
A human activity – intentional, purposive, conscious and subjectively meaningful sequence of actions. Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater environment for pleasure, competitive sport, or as a means to reach a work site for profit or in the pursuit of knowledge, and may use no equipment at all, or a wide range of equipment which may include breathing apparatus, environmental protective clothing, aids to vision, communication, propulsion, maneuverability, buoyancy and safety equipment, and tools for the task at hand.
Autonomous diver, also known as Autonomous Diver or Autonomous scuba diver – International minimum standard for entry level recreational scuba diver certification
Glossary of underwater diving terminology, also known as Glossary of underwater diving terms or Glossary of SCUBA diving – Definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
Human factors in diving safety – The influence of physical, cognitive and behavioral characteristics of divers on safety
Human physiology of underwater diving, also known as Human physiology of diving – Influences of the underwater environment on the physiology of human divers
Human torpedo – Early form of diver propulsion vehicle
Hydreliox – Breathing gas mixture of hydrogen, helium, and oxygen
Hydrocleaning – Use of a water jet for cleaning hard surfaces
Hydrogen narcosis – Psychotropic state induced by breathing hydrogen at high partial pressures
Mechanical dead space – Space in breathing apparatus in which the breathing gas must flow in both directions
Mechanism of diving regulators, also known as Mechanism of the diving regulator – Arrangement and function of the components of regulators for underwater diving
Media diver – Professional diver working in the media sector
Media diving – Underwater diving in support of the media industries
Medical fitness to dive – The medical fitness of a person to function safely underwater under pressure
HMS Royal George (1756)#Salvage attempts – 100-gun first-rate Royal Navy ship of the line (1756) – Early salvage operation using bells and surface supplied divers
Surface-supplied diving skills, also known as Surface supplied diving skills – Skills and procedures required for the safe operation and use of surface-supplied diving equipment
Timeline of diving technology, also known as Timeline of underwater diving technology – Chronological list of notable events in the history of underwater diving equipment
Tissue (biology) – Group of cells having similar appearance and performing the same function
Turkish Underwater Sports Federation (TSSF), also known as Türkiye Sualtı Sporları Federasyonu – Turkish national governing body for underwater sport and lifesaving