Divers Alert Network

If you’re a diver you should be a member of DAN (Divers Alert Network).
Started in 1980 by Dr. Peter Bennet of Duke University as the national diving accident network it has now become the worlds premier organization on divers health research.
DAN will cover emergency procedures if you have a diving accident including emergency medical evacuation as well as any hyperbaric treatment that you may need.
They also provide a free 24-​hour diving emergency hotline
1−919−684−8111 or 1−919−684−4DAN (4236).
There is also a medical information line 1−919−684−2928 if you have any worries about a type of medicine or any health situation that may be a contraindicator for diving.
Dan also has instructors all over the world that so you can learn about variuos subjects such as oxygen first aid, first aid for hazardous marine life injuries etc. Online seminars are also available for $ 25 each, well worth the price considering the subject matter.
They also provide travel and equipment insurance.