There are some new info in the latest account I'm wondering about. First, an answer to one of the questions.
Relationship between DM and victim
I later found out that she was the DM and her buddy was Mrs Wood.
Things I'm wondering about:
I quickly swam to my wife and passed on the sign, buddy missing, my wife kind of blew me off so ... I located the lead DM and signaled that there was a major problem and a diver was missing I counted the divers becuse I remember on the boat they said that there were 15. The lead DM saw me counting and swam over to calm me down, I kept signing to him that we were a diver missing, all the while he continued to tell me it was not a problem.
After completing the safety stop I was the second diver onto the boat. I dropped my bottle and ran upto the captain and told hime of the problem we had below, he said not to worry it was probably a group doing some thing and not to worry.
About 5 mins after I surfaced the DM came up and I told him what I had seen, he tried to calm me down and tell me that I was over reacting, I had only seen the 3 deep divers and not to worry about it.
For those who are instructor/DM level and any captains here what is the standard protocol when a diver gives you a diver missing signal or comes up saying there is a missing diver? I can see this would be really tough to determine as there sounds like with 4 DMs in the water there were almost 4 distinct groups and the diver flashing you the signals may have just missed a dive group.
A further question is there any protocol if you were in the DM's position and had your diver go missing or as it sounds just diving down without paying attention to your repeated calls? Should you try and get the attention of your fellow DMs to help you out?
I'm also wondering if there should be some "universal" distress signal dive leaders should give or even just some sort of alert mechanism dive operators should work out with their DMs? I'm thinking of something like equipping all your DMs with air horns and if there is an issue to do 3 fast blasts or morse SOS. Any of the pros in the room ever have anything like this setup?
It was only when the DM who was with Mrs Wood came up that things changed very quickly. The DM came out of the water and was very upset on the verge of crying. The DM on the boat tried talking with her but she wasn't able to speak at all.
ScubaSteve mentions the DM should have been able to communicate. There are many cases of people who are in shock who can't communicate. Without benefit of other information, based on the description, it sounds like the DM could have been in shock.
The DM's switched there NITROX bottles for regular bottles and jumped back into the water. After around 15mins the 4th DM who was taking the deep water advanced group surfaced and told me that he went down to 140ft to try and stop Mrs Wood.
It sounds like more than one DM attempted to save her. Whether the 4th DM was at 140 and she was far below him or the 4th DM had her at arms length we don't know.
One of the takeaways for me is the importance of a slate for communicating. I am wondering if there was something on hand where halcyon could have written something like "DM is missing diver, needs help!" or "DM in trouble, diver is below 140ft, needs help!") if the other DMs would have taken him seriously. I should likely add I think halcyon did everything possible and at his disposal to alert the DMs.