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.... Blocks of ice cut to form the hole are stacked to one side, and a second diver sits on the edge of the hole with his legs in the water. A rough wooden lad ...al problems due to density, viscosity and chemical compatibility of diving equipment, as well as possible environmental hazards to the diving team.<ref name="Hi ...

{{Short description|Ballast carried to counteract buoyancy}} {{Infobox diving equipment ...

{{short description|Equipment for controlling the buoyancy of a diver }} {{Infobox diving equipment ...

====Buoyancy==== {{main|Buoyancy}} ...

{{Short description|Equipment allowing or assisting the user to breath in a hostile environment}} ...r]], or [[resuscitator]] may also be considered to be breathing apparatus. Equipment that supplies or recycles breathing gas other than ambient air in a space u ...

...hanging the amount of water and air in [[ballast tank]]s to affect their [[buoyancy]]. ...yal Navy refers to "These powerful boats"[https://www.royalnavy.mod.uk/the-equipment/submarines], and in at a speech in Washington, Adm. Sir Philip Jones announ ...