Outline of underwater diving

See the Glossary of underwater diving terminology for definitions of technical terms, jargon, diver slang and acronyms used in underwater diving
See the Index of recreational dive sites for an alphabetical listing of articles about places which are recreational dive sites
See the Index of underwater divers for an alphabetical listing of articles about underwater divers
See the Index of underwater diving for an alphabetical listing of underwater diving related articles
See the Outline of recreational dive sites for a hierarchical listing of articles about sites used for recreational diving

The following outline is provided as an overview of and topical guide to underwater diving:

Two divers wearing lightweight demand helmets stand back-to-back on an underwater platform holding on to the railings. The photo also shows the support vessel above the surface in the background.
Surface-supplied divers riding a stage to the underwater workplace

Underwater diving – as a human activity, is the practice of descending below the water's surface to interact with the environment.