What is Deep diving?
[[File:Deep Sea Diving Suit.jpg|thumb|right|200px|{{Center|Armoured suit for deep diving}}]] In '''deep diving''', [[diver]]s use a [[Breath|breathing]] [[apparatus]] (a supply of air carried on their backs). Or they may be supplied with breathing [[gas]] through a [[hose]] from above the water. This allows them to dive to some of the deeper parts of the [[ocean]]. Commercial divers may use different [[gas]] mixtures ([[Helium]]-[[Oxygen]] for [[example]]).<ref name=Christensen59.0>Robert W. Christensen, ''The Simple Guide to Commercial Diving'' (Ventura, CA: Hammerhead Press, 2004), pp. 59–60</ref> They may also use armoured [[diving suit]]s pressurized to [[Atmosphere (unit)|one atmosphere]].<ref name=Christensen59.0/> A deep dive is considered anything below a depth of about {{convert|30|m|ft}}.<ref>Chris Humphrey; Amy E. Robertson, ''Honduras Bay Islands'' (Avalon Travel Publishing, 2010), p. 13</ref> This is still not very deep compared with the deepest parts of the ocean. Divers sometimes stay underwater for long periods of time. Sometimes they do work on [[oil well]]s and [[pipeline]]s. Sometimes they explore sunken [[ship]]s to see if they can retrieve items from the ship or help to bring the ship up to the [[surface]]. One of the [[danger]]s of deep diving is [[decompression sickness]].<ref name=USN2-23>United States, Naval Sea Systems Command, ''U. S. Navy Diving Manual: Air Diving'' (Washington, DC: Navy Dept: Superintendent of Documents, U.S. Government Printing Office, 1988), p. 2-23</ref> That can happen if divers rise to the surface of the ocean too quickly.<ref name=USN2-23/> For that reason recreational divers need to be certified to show they have training to dive to a specified depth range.<ref>Brooke Morton, 'Nirvana', '' Sport Diver'', Vol. 16, No, 5 (June 2008), p. 28</ref> ==References== {{commons}} {{reflist}} == Other websites == * [http://www.encyclopedia.com/topic/deep-sea_diving.aspx The Columbia Encyclopedia, 6th Edition] {{stub}} [[Category:Diving]]