Depth and Ignorance Can Kill. Was it the lure of depth, his lack of awareness of how deep he was, or the inability to understand his computer? According to witnesses at a Cayman Coroner’s Court, Victor Crawford, a 62-year-old diver from Alabama and passenger aboard the Cayman Aggressor, had dived to a depth of 95 metres whilst using nitrox with a maximum operating depth of 33 metres. Health Services Authority pathologist Dr Shravan Jyoti said the cause of death was seawater drowning as a result of ‘nitrogen toxicity’.
Mr Crawford went missing in March last year during a group dive before divers from Ocean Frontiers, a well-known Cayman technical diving operation, discovered his body. His death had been the subject of controversy when the ambulance took more than an hour to arrive at the East End dive shop to where he was recovered and then left without the body.
Although witnesses said that the deceased was an experienced diver, Department of Environment deputy director Scott Slaybaugh said the case involved “a series of actions which were significantly hazardous and far beyond the standard of safe diving practices.”
These included leaving the group to dive alone and ascending rapidly without making the decompression stops mandated by his computer.
Coroner Eileen Nervik read statements of four witnesses to the case, before the jurors deliberated and came to their verdict of misadventure. (Abridged from the Cayman Compass)
There’s a feeling of instant camaraderie among the passengers on a liveaboard dive boat because it’s in the interest of everyone on board that nobody has an accident. However, you don’t usually know everyone beforehand, neither do you know their levels of diving skill.
A diving computer in time-keeping mode.
We will never know what the true circumstances of this tragedy were, but it is likely the casualty did not read or was unable to understand what his computer was telling him. Clear calm water can be seductively dangerous.
The water at Ras Mohammed, a wall at the southern tip of Egypt’s Sinai, can be incredibly clear . The water here is said to be around 600 metres deep so you don’t want to drop anything. It’s so clear in fact that you can be misled into going deeper than you intended
We might have all done that but imagine swimming alongside that steep wall of Shark Reef at 30 metres deep, breathing nitrox 32, and seeing one of your fellow divers in distant perspective way down below you?
What to do?
Already the dive had not been going as planned. Our dive guide opted to take the rest of the passengers in another direction and I found that as a former dive guide, I’d somehow been co-opted into leading this small group.
We had intended to drop in at Shark Reef and swim round to Jolande Reef but the current was intense against us that we were all working hard at making any headway at all. Then suddenly I noticed this member of our group down at great depth.
The water was so clear I could see that he was wearing a tank marked as containing nitrox just like mine so I took the risk of passing my maximum operating depth and hurtled down as fast as my ears would allow to signal to him to check his computer and follow me back up. He had been at almost twice the operating depth for the gas he was breathing.
Imagine my horror when only a few minutes later he was back down at more than 50 metres deep, swimming along happily oblivious to the danger he was putting himself in.
I swam down hurriedly again, thinking that it would be my bad luck if it was me that got an oxygen hit in the process of rescuing this diver who was totally unaware he needed rescuing. Again I signalled in an extremely animated way that he should look at his computer, pointing at his mask and then at my own computer that by now was singing a merry tune thanks to exceeding the maximum PO2 I had previously set on it. It was this moment at which he responded by offering me a naked wrist that indicated he was not wearing a dive computer.
What an idiot. I was furious and took his arm firmly, dragging him back up to the apparent safety of 20 metres. I didn’t let go of him for the rest of his dive. Where was his buddy? It was his teenage son who’d obviously given up on his father and was swimming above us with two other divers, in the shallows, trying to conserve his air against the hard finning he was doing.
I was angry to say the least. I kept thinking that this person whom was known to me only because we were on the same liveaboard boat, had forced me to take risks with my own health and seemed oblivious to that fact. On the other hand, had he gone missing it would have ruined the trip for everyone on board.
Eventually, after a precautionary extra wait at 6 metres (since I had no idea of his dive actual profile and mandatory decompression stop requirements) we broke the surface at which point I emphasised in no uncertain way, “Nigel, if you forget to put on your computer, you must go back to the boat and get it.”
If your computer was to display this, would you know what it meant?
His reply was unprecedented. He said in a quite matter-of-fact tone, “I decided not to bring my computer because it had stopped working. It went into SOS mode on the previous dive.”
There are some fabulous new computers available at Ocean Leisure and the staff will be pleased to show them to you. However, they cannot demonstrate the core function of a computer without being underwater with you!
Please read the instruction manual of your diving computer. Although you may always use it in No-stop diving mode, be aware what the display looks like should it go into Deco-stop mode. It will show a stop depth and either a total ascent time or a stop-time or both at this time. Don’t ignore it. Your computer will help keep you from danger, but only if you’ve read the instructions and fully understand its display.