page_title: Outline of underwater diving
section_title: Modes of underwater diving
hierarchical_section_title: Outline of underwater diving / Diving activity, by type / Modes of underwater diving
caption_attribution_description: Français&#160;: Photo prise pendant un stage de qualification spécifique «&#160;plongée de bord&#160;» dispensée par l'institut national de plongée professionnelle de Marseille.
context_page_description: The following outline is provided as an overview of and topical guide to underwater diving:
  Underwater diving – as a human activity, is the practice of descending below the water's surface to interact with the environment.
context_section_description: There are several modes of diving distinguished by the equipment and procedures used:
  Freediving – Underwater diving without breathing apparatus
  Scuba diving – Swimming underwater breathing gas carried by the diver
  Surface-supplied diving – Underwater diving breathing gas supplied from the surface
  Saturation diving – Diving for periods long enough to bring all tissues into equilibrium with the partial pressures of the inert components of the breathing gas
  Atmospheric pressure diving – Diving where the diver is isolated from the ambient pressure by an articulated pressure resistant diving suit.
  Unmanned diving – Diving by mechanisms under the direct or indirect control of remote human operators for observation, data collection or manipulation of the environment using on-board actuator devices
caption: Surface-supplied diver with helmet, bailout set and umbilcal cable
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