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Reality is a bit more complex than that. The static pressure of the tank e.g. when no air is flowing out of the than is e.g. 3000 psi, as soon as the tank is open connecting the pressurized tank to the environment through the valve the gas starts flowing. If we neglect gas expansion and we...

Peace to their souls. It is not easy to understand what happened, and the investigation is still running, but a survey and a comparison of the news points out that of 8 ppl including an instructor and two guides was heading to the cave of blood. (e.g. Tragedia nella ‘Grotta del...

Actually the issues lays beyond the experimental evidence supporting the tables. Despite decades of research the physiological processes underlying decompression are poorly understood. So we have models of body compartments that are not really coupled with real body organs or tissues and we...

First of all you are a paying customer and you can ask for and pretend to receive the service you are paying for. SO my Academics first, then water skills and further training. All unpaid work you are doing, especially because it is unrelated to your DMC, like rinsing vans etc. is at your own...

Actually if you have to use your algebra to design a bridge and you find the wrong X finally the bridge will collapse and a lot of people will die...

Great post! There are a few other hystorical and practical reasons behind the use of the metric system and the nautic relations between degress, nautic miles, and knots. Speed on boats are measured in knots, which is equals to nautic mile per hour. One nautic mile is a bit more than a common...

I think 500' of line are wort your 500$ ;)

I was at the pool and I tried out breathing every stroke and every two strokes. I do not feel comfortable with that and the overall movement is quite messy. Breathing every to strokes works fine. I am a bit slower but I breath much ofter and avoid air debt. So I tried a couple of leaps...

Thank you very much for the cool tips, I am a kind of slow swimmer, I can swim 1000yards in less than half an hour, but I need to get faster on the 400 yards. @halocline I spoke with an assistant at the pool and she told me to try the best I can do on 100 yards, take one minute to recover and...

Thank you very much for all your advice. I got my books and I am studying, the exercise are not that difficult, in the end. Now I am approaching the water skills part, and started working on stamina. Any training tip to improve swimming? By now I am brute forcing on 100 yards with 1 minute...

The video is somehow odd, It looks like the diver perfectly knows what should be done and he is making exactly the opposite! He is negative, has to keep away from the bottom kicking continuously, the fin movement is bad and all the gear is hanging around in the water, the console is lose and...

Hi Supergaijin, Thank you very much for all the information. @ Steve that's an option! By now I am still evaluating feasibility. btw I have 52 dives logged, I restarted logging them last yeas because old logs got lost somewhen in the movings, I hope I'll get to 60 before July. @ RickyF: Yes, I...

Hi folks, It is a while that I am thinking about making a divemaster certification. Before starting I am evaluating the time requirements and the effort required to do things properly. I have about two weeks in summer for my internship and some time to prepare for the theory. I made some...