Just a word on the coughing. I am a mild asthmatic and was very concerned about learning to dive since I did some research on the subject and read several stories of people with asthma dying during diving. The problem is that the air passages in the lungs swell with mucus. That mucus can trap air and cause a lung embolism, even if you don't hold your breath. Therefore, I don't dive with the slightest hint of asthma. On the first day of diving I always take a precautionary "hit" off my inhaler, even when I don't have asthma. Even with that, there have been a couple of times in my early diving career that I experienced the start of asthma while under water. I always keep my ascent rate to the slowest measurable rate of one green bar and if I suspect asthma, I cough and breathe out hard.
I would ask all dive masters and instructors to be aware of this potential problem and never let a diver dive with a cough, especially if it sounds like they a lot of mucus in their lungs. I am so sorry for the loss of this woman, and I can't understand why any boat operator would let this woman dive with such a heavy cough. Perhaps they were not aware of it if she was taking a medicine to calm the cough. Problem is, I hope it was not a diver who advised her that taking the medicine would make it OK to dive.
Diving last year on the Caribbean Explorer I, we were dropped into a 2.5 knot current. I think having a lifetime of experience with asthma saved me from potential disaster. I saw my fellow divers overexerting themselves to fight the current. I've always understood how to pace myself and have learned how not to panic with restricted breathing, even before I started diving. Early-on in this dive, I knew the current was bad and started forcing myself to take slower, deeper breaths and work at a slower pace. I fell behind about 50 feet, but still could see everyone. My sister (who has no asthma, with more than 60 dives) had a severe panic attack that started with her body forcing her into shallow fast breathing. She said she pulled the reg out of her mouth because of the overwhelming desire to breathe and came very close to breathing in water. Another guy, much younger and totally in shape with nearly 300 dives admitted he had the same experience on this dive. They were lucky they did not lose any divers on that day. Both my sister and this other guy were obviously overcome with this experience and felt lucky to be alive. The lesson here: please watch yourselves in extreme situations like this. Be aware when you start to overexert yourself that you begin to build-up CO2 by overbreathing your reg. Your body will take over and force you to start hyperventilating, leading to panic and a nearly uncontrollable urge to breathe. If you are continuously having to kick hard, you are overexerting yourself. Best to call the dive off, go to the surface early in the dive so the current doesn't take you too far from the boat. My sister said she thought everyone else was doing it, and there must have been something wrong with her because she was having trouble keeping up. She said she was unaware that she was fighting such a strong current. When absolutely no one could make it 30 feet to the anchor line from the front of the boat - there was no doubt in my mind right from the start that we were in a very strong current.
In this situation, if the woman's problem had been overexertion from current (as some have suggested), I think she would have likely drowned instead of collasping later on the boat.
Karen