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  1. J

    Manly Beach fatality - Sydney, Australia

    I know the spot well. AFAIK more popular with free divers, as it is a bit of a scramble down the cliff to get your gear onto the rock platform, and it can be very exposed if there is any significant swell. The first time my buddy & I dived it we took small tanks, entered off the rock platform...
  2. J

    Diver sucked into power plant pump - Kentucky

    I've worked in a couple of large facilities where we had to be in close proximity to high voltage or high power RF equipment and in both cases we used a system like this. Each of us had a key lock on the main breakers and it was impossible to access the hazardous area with the system powered on...
  3. J

    Manure and food waste digester fatality - Stockton, Illinois

    This must have been a huge tank. The text says "a million-gallon anaerobic digester". I've no feeling for the approximate dimensions, but if that's correct, the thing could have been 40 or 50 feet deep. Even though he sounds like a very experienced commercial diver, none of that would have...
  4. J

    Manure and food waste digester fatality - Stockton, Illinois

    Three clear acute hazards: hyperthermia due to the 50 C liquid, no breathable atmosphere inside the tank, and "he was unable to return to the top of the liquid in the tank" - so possibly a buoyancy issue, maybe caused by the layer of foam mentioned later in the article. Human defence...
  5. J

    Cape Cod lobster diver swallowed by whale, ejected

    Which agency will be the first to offer this as a "Specialty" course?
  6. J

    Tiger shark attack - Quondong Beach, Western Australia

    The rules are different between states. In NSW, Queensland, SA, and the NT, spearfishing on scuba is banned. AFAIK it is permitted in Victoria and WA - but most spearfishing is done by free divers.
  7. J

    Girl dead, boy injured - Lake McDonald, Glacier National Park

    As I read the account of this incident, I shook my head in disbelief and sadness at the fate of this young woman. How could anyone take a novice diver on an 18m dive in a drysuit without a power inflator - never mind a qualified instructor?
  8. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    We're probably just agreeing. In your previous post you only talked about labels, and I made the point that labels alone are not recommended for mitigating a potentially deadly hazard. In your last post you said labels plus storage plus other physical measures. and there I would agree. For a...
  9. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    I'm saying that the study of many years of incidents by experts teaches us that warning signs and labels by themselves are not a very robust protection against hazards. Sure, you and I both understand "DO NOT BREATHE". What if the tank said, "呼吸しないでください"? If you have an electricity sub-station...
  10. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    I'm not an expert in safety, but what little I know was taught to me by a Safety Engineer who had worked on nuclear subs, and he did know what he was talking about! Labels are a good example of things that are well-intended but can easily go wrong. Warning signs are usually pictorial, not...
  11. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    Your heart goes out to the families involved. What a terrible, tragic accident. These poor people's lives will be shattered, but I hope in time they are able to find some peace. There are no words ...
  12. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    Isn't this like one of the basic principles of safety engineering - human error is inevitable, and if it is possible to screw up then someone will? For example, on twin-engined aircraft, the fire suppression systems for L and R engines have physically different connectors so that it is...
  13. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    As far as I understand it (as an engineer, not a medic) "cerebral" simply indicates the site where the damage caused by the embolism occurs - presumably with the potential to cause fairly rapid and severe symptoms. But the idea of two children having the same medical event does seem unlikely...
  14. J

    Children die playing with scuba gear left in pool - Jensen Beach, Florida

    CAGE is a serious hazard in a swimming pool if the person doesn't understand basic dive physics, especially for children: Should children be SCUBA diving?: Cerebral arterial gas embolism in a swimming pool - PubMed
  15. J

    Woman drowns during training - Hidden Paradise Campground, Indiana

    I may be a dinosaur but, for scuba diving in a wetsuit, I like weight belts! They are simple, robust, everyone knows how to operate them, and you can see at a glance how much weight there is. Now everyone seems to dive with complex, proprietary, "integrated" weight systems, and a couple of...
  16. J

    Woman drowns during training - Hidden Paradise Campground, Indiana

    Some years ago in Sydney, a young tourist drowned while SCUBA diving at a very shallow, sheltered dive site at Cabbage Tree Bay on Sydney's Northern Beaches where we live. You would struggle to log 6m depth there, and at any time the shore or beach is an easy swim away on the surface. And yet...
  17. J

    11 y/o Surfaces with Convulsions

    AGE seems like the likely hazard for an inexperienced diver in shallow water. However, I remember an incident in Sydney many years ago where a young instructor or divemaster ended up with apparent DCS following a couple of days of repeated "up and down" dives in a pool assisting with a training...
  18. J

    Lancaster Hole cave fatality - Casterton Fell, Cumbria, England

    It is almost certainly poor wording from a journalist without knowledge of the subject, repeating what they have heard with a bit of misunderstanding & misinterpretation thrown in. Reading between the lines, it sounds as though the breathing loop had become damaged in some way and he switched to...
  19. J

    Fatal dive accident - Lake Werbellin, Germany

    As a young engineering student living in dismal housing in northern England, one of my friends suffered mild CO poisoning from a faulty gas heater. She experienced extreme disorientation and vivid, frightening hallucinations - not symptoms I've heard discussed with reference to CO.
  20. J

    Ginnie Springs diver missing - Florida

    Isn't tolerance of PPO2 quite a variable and personal thing? One of the guys I learned to dive with was an ex-Navy diver, and they were selected for a high tolerance to PPO2 (they dived with O2 rebreathers at that time). He suffered hypothermia after a problem with his suit and following his...
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