http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Medicine/sectionr.htm
DAN is supported by membership dues (180,000 members), sponsoring corporations, and the
sale of dive-safety-related materials such as textbooks, videos, and oxygen equipment.
Since its founding DAN has gained world-wide reputation as the pre-eminent source for
information on diving safety, and as an aid for divers in need of immediate help and/or
referral to a hyperbaric chamber.