In June I dove with the Aggressor II in Palau. The reef hooks have a release exactly like a dog leash which you may attach to yourself or just hold onto. Hand fatigue is an issue.
Here are the main safety issues I observed:
1. This is a complex dive requiring a potentially new skill. Fast current, higher than normal exertion level, maintaining buddy proximity and monitoring (rarely happened), attempting to find a "dead" piece of coral or rock to hook into and peer pressure are just some of the factors that could lead to a hazardous dive. Obviously, there is no way for me to be sure but it sounds like the woman who died for some reason paniced. The one fact that her weight belt was dropped (she was taking some action) instead of simply releasing the reef hook (Which it sounds like would have been possible since the current was not too strong) could be fatal. The process once you are hooked in is to inflate your BCD. If she dropped weights and inflated her BCD further, she would not have been able to remove her reef hook without cutting the line. Not an easy skill to find your knife with no mask on, cut the line - with no buddy assitance while panicing.
The problem is that this is an advanced dive and panicing while hooked in to a reef hook is simply not an option. Divers should be very confident before going to Palau.
As far as damage from reef hooks goes, make no mistake about it the REEF HOOKS ARE KILLING THE REEF. I was supposedly with a boat full of very experienced divers. Many had over 1000 dives. I personally saw substantial damage occur. Divers with camera rigs as big as my car in fast current trying to get to the perfect spot for the perfect photo. I left my monster rig at home and went with the small one. Blue Corner, the famed Palau dive spot which has probably 100 divers visit it each day, looks nothing like the other less frequented dive spots. The coral is mostly dead. It will all be dead in 15 years. Guaranteed. The problem is not so much the reef hook, it is the line coming from the reef hook. After you hook in the surge is moving you all around and you basically become a coral lawn mower. It is horrible. Plus, when you have that many people that close to a reef the amount of contact is significant. I saw fins hitting coral, stressed divers wearing gloves holding on, divemasters with hooks swimming around and instead of finning just hooking in every few feet and pulling themselves along, dive masters and others using hand holds. You get the idea. Basically the REEF IS ALREADY DEAD. That said, I guarantee you that nobody on the boat believed they caused any damage...but they did...a lot of damage. And somebody else is causing damage today.
As far as the Palau Aggressor II goes, I was unimpressed. The boat is beautiful, the above water operation is professional, the people are very nice, the food is great, the protection of the enviornment and the diving practices are the worst I have ever seen on any liveaboard. First of all, they do not reinforce the buddy system. To the contrary. On my first dive I saw someone swimming alone in poor visibility who I knew entered the water with a buddy. I approached her signaling, "Where is your buddy?" and she just pointed off into zero viz and gave me the shrug. She was an "Advanced Diver" with about 35 dives. This happened on every single dive all week. On our boat there were only 3 buddy teams that maintained proximity. This is no exageration when I say there were buddy teams surfacing more than 10 minutes apart from each other every single time they went diving. No, they did not have pony kegs or training for this. I ended up knowing these people fairly well. In my opinion, it was CRAZY! These were challenging dives. We went into overhead environments, used reef hooks and had some serious current. The Aggressor staff would not even make a comment. Not at the dive briefings, NEVER! They would only say something if you stayed down for over 60 minutes. If you were down 61 minutes they would make a comment but if you came up at 59 minutes and your buddy came up at 49 minutes - maybe 300 meters away - not one word.
One smaller point. The Aggressor staff creates shark feeding frenzies for the entertainment of their guests by throwing turkey carcasses, ribs whatever overboard. Once they did it the guests started doing it. I have never seen this level of environmental disregard from the crew of a dive operation.
The procedure on the Aggressor is that three divemasters go on each dive. One leads, one in the middle and one at the end. So, don't think a dive master was with these non-buddy groups. Lastly, they put individual EPIRB GPS locators on the divers in case you get swept to sea which has happened several times in Palau. One buddy team within the past year was out drifting for 10 hours or so (not from the Aggressor). Here is the kicker... They did not have enough EPIRBS so a few buddy teams had to share. But there were no buddy teams. Get your own EPIRB if you go!!! God knows you paid for it.
Side note: Many on the boat had sinus issues. I don't know anything about anything but there was literally 1/2 inch of mold in the stateroom bathrooms. Only in certain areas like the fan and behind the poles next to the showers where the maid cannot reach but it smelled like mold and you could see large areas of it. If you have a mold allergy, you cannot go on the Aggressor.