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Air / pressure will not relax this reflex, I had it occur once freediving in water that was 54 f. It will relax in most cases after a few seconds or after the stimulus is removed, when it happened to me I was decending and could not exhale beyond my larynx so could not valsalva. I agree (and...

Yes it has occured in both drowning victims and diving casualties. It can also occur for a variety of reasons on the surface, cold water is not the only cause. During autopsy most drowning victims are found to have aspirated very little water, about 10% of victims have aspirated no water at...

Hey Blades, welcome to this site! Did you guys head to DEMA this year?

Not really for tec diving but they are very popular among military, commercial, public safety, and anyone requireing communications (fear factor, history channel, discovery channel, etc.) What type of mask are you diving? What is available over there?

It is a 50 foot tower, it used to be used for both practicing ascent from submarines and free ascents from 50 feet. Currently combat divers are still trained in submarine ascents but no divers practice free ascent (there is also a recompression chamber on-line at the top of the tower) the...

Ports facilities often have elevated levels of toxins in the sediment, some of the toxins are from old bottoms paints used in the US, contaminates currently from ships from overseas, and washed in contamination from harbor operations. During some recovery operations we have had to have blood...

Hard to say, I went from teaching at the Naval Diving and Salvage Training Center to teaching at FSU. I purposely tried to not be militaristic with the students but am sure I was more rigid than most instructors. That is really a question for students to answer...

Well your current arrangement is certainly the better one, one of the problems with the one man outfits though. There was a case when OSHA went after the captain of a vessel for hiring "subcontractor" non-commercial divers to work for him, the example was not hull cleaning but sea urchin...

Hey Shane, I have not made it outside the bay since the storm, all our work has been insdie but it is clearing now. I am heading down to the beach to inspect a concrete pier that collapsed Friday or Sat and will let you know if there is any visibility. One good thing is the storm drew...

We have OSHA - 29 CFR and Coast Guard - 46 CFR, there is minimum standards for training, equipment, and manning. Currently few investigations are conducted unless there has already been a casualty, unfortunately this leaves plenty of room for people to work in violation of the regulations...

Sounds like a great job to me!!

Man I thought the place was really neat, did not spend the night but took a tour of the lodge (it was not occupied at the time) with one of the designers during last years DEMA. I think it would be a neat experience...

If you explore Sir Edmund Halley's bell you will find he did a dive over two hours in the Thames river at a depth exceeding 60 Feet. He does not mention any symptoms in my reading but would certainly have incurred a decompression obligation. He also designed a wieghted barrel system to...

NOAA, EPA, Customs, FBI, train agents / employees to be divers, they do not hire out unless the situation (haz-mat is one example) calls for a more qualified team (commercial) NOAA does have one job description that I have always found pretty cool, fisherman (you go out and catch specific...

What is your background? (what do you do currently) Educational / scientific diving - a diving safety officers job is to ensure scientific projects are planned and conducted in accordance with an organizations diving policy (normally within the university system). Normally these individuals...

The course is put on by Florida Keys Community College, it sounds like a pretty good course. The training search is conducted with a blacked out face mask so although the students could be observed for safety they get the experience (somewhat) of blackwater. Maybe the training (if not to...

My statement originates from the original post asking the question, there is not a signifigant reason to include the weight of air in this calculation. The problem is calculated using Boyle's law and Archimedes principle. Making the statement that the weight of the air will effect a lift this...

Yes Pete I have, and I still agree with you that the weight of the air would have nothing to do with this calculation.

I am just curious why you did not seek the advice of a medical specialist after surfacing with what could have been a neurological symptom? Do you know that you touched something or did the symptom just show up after you surfaced? Did a rash ever develop or was it just the tingling then...

original question.