Besides the issue of what gas mix she was diving which touches on the possibility of ox-tox (32% nitrox is offered on the Aggressor), I had a few thoughts regarding the incident. Current is not something to be taking lightly. The powerful current is a factor that may have contributed to buddy separation. It sounds like everyone was working very hard in that current. Under such conditions, I think of carbon dioxide retention and how this might exacerbate narcosis at greater depths. Current can knock off a mask. Losing a mask in challenging conditions can lead to panic. We'll never know at what point Eloise lost her mask and whether it contributed to her death.
I have no knowledge of the underwater topography, but with such strong currents and the possibility of sharp changes in wall structure I have to wonder about downdrafts/updrafts and the concomitant challenge of maintaining depth control. Anyone diving in such conditions should have a game plan for recovering from "vertical" currents. It may seem counter-intuitive, but a technique to get out of the strong flow is to move away from the wall. I have no idea whether a downdraft occurred or even if this technique might have been useful in the scenario. The author describes a sloping contour that would seem to argue against the presence of a wall on this particular dive. I raise this issue purely as a "what-if" that might lead to more discussion or thought.
I was bothered by the author's language regarding the check-out dive. Experienced, well-trained divers shouldn't be "struggling" to determine weighting requirements even considering that completely novel gear (thick wetsuit, hoods, etc.) is being used. Doing a proper weight check is a basic OW skill. With experience and each gear change, I think a diver should be getting ample practice with conducting weight checks. If this isn't the case, then perhaps more/better training is indicated.
I feel bad for Denise. I'd be very interested in hearing what led to the initial buddy separation. Although I hope this is not the case, it is possible that Denise was following the DM closely and didn't notice that Eloise was falling behind. My training has emphasized that remaining with one's buddy is more important than staying with the DM or DM-led group. Holding hands with a buddy, as John Bisnar apparently did with his wife, is a valid technique for sticking together. It's interesting to note that Denise and Eloise seemed to fit the definition of "insta-buddies" -- no previous dives together, no shared experience to draw upon in the face of challenging dive conditions. FWIW, I'm not sure there's anything Denise could/should have done differently once the buddy separation occurred. The DM, an experienced guide with local knowledge of the waters, directed Denise to stay with the rest of the group while he searched for Eloise. She did the correct thing by remaining with the group.
It sounds like Patricio gave a fairly decent dive briefing on-board the Aggressor. Considering the unpredictable surface conditions, I think it's reasonable that any pre-dive discussions in the panga prior to splashing would be very brief. As has already been mentioned, buddies should be doing final equipment checks on their own. From reading the account, my impression is that overall the DMs acted responsibly.
On a side note, I was interested in finding out a little more about the person writing the eyewitness account. After viewing the other blog posts on the author's
http://www.bestattorney.com/ website, I can't help but think the site smacks of ambulance-chasing in the 21st century. The implied message behind most of the blog posts is: look at this accident, these people should contact a personal injury lawyer to explore whether they can get financially compensated for their experience. Just thinking out loud here...but personal injury law in SoCal must be very lucrative since
John and his wife had floor seats at the Staples Center for the Laker-Magic NBA Finals last year. Despite my distaste for how the author conducts his business, I am sorry to hear about his Galapagos experience.
I am unsure of the legality of copying-and-pasting Bisnar's blog post to SB. There isn't a specific legal statement on the website prohibiting copying of the content, although there are technological measures in place (Copypaste) to deter such behavior (
refer to the bottom of the blog page in question).