I was on the Aggressor II for the trip 11-18 Feb 10 and would like to add some additional information that may fill in some gaps regarding the initial report and the replies and questions. My understanding was that Eloise was a qualified Master SCUBA Diver with 50+ dives experience and not a Dive Master. Her last dive, according to her declaration, was during April 2009.
Before the second dive of the trip I was interacting with Eloise regarding measuring her nitrox mix and setting her computer to reflect the reading. The mix was 32% nitrox. She was not familiar with how to use the sensor so I showed her and advised her that her computer needed setting to this reading. She had a 'Gecko' dive computer so, using her abbreviated instruction card, we set it and checked her PPO2 setting. It appeared to me that she was not very practised in using nitrox.
During the initial phase of the dive I did notice her descent from the 'panga'. I noticed she was descending and was holding her demand valve in her mouth with her hand. Although I was concerned by her relative inexperience and the fact she had not dived for a year, I was reassured by the fact that her buddy was a Dive Instructor.
I was not concerned or in anyway stressed by the dive briefing. It covered terrain, expected currents, depths, expected water temperatures and safety procedures if we were separated on the surface. Jaime asked if there were any questions, few relevent to the dive were forthcoming.
During the initial stages of the dive the currents were mild but on reaching about 30 metres the current did strengthen and was pushing us into deeper water. At this stage we were instructed to make our way to shallower water by Patricio. It was when we had all regrouped that Eloise was noticed to be missing.
In my opinion Patricio did everything he could have done under the circumstances. It was a regrettable incident but, good individual dive skills and buddy procedures may have prevented it.