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If your friend is absent minded then I'd probably be more concerned with stuff like forgetting to connect his inflator hose, turning on his tank valve, forgetting his dive computer on the surface, navigation and situational awareness underwater etc.. I think narcosis would probably be the...

I did a one week Deep South mini safari - we went all the way down to Dahrat Abid the Southern most site 50km and the from the Eritrean border and worked our way up. It is not as relaxed as a two week cruise but can be done and they do cover a lot of the great sites... depending on weather...

Dive a lot more and get some good experience as a DM first.

They are both excellent and I doubt you will really notice a difference with respect to inhalation effort. As has been mentioned already, it's best to pair either with a high performance first stage. I'm diving the MK25 and S600 and they have been very reliable and a nice breath at depth...

Jan/Feb/March is a very good time to visit the North of Sudan. Dive sites like Angarosh, Abington Reef, and Shaab Rumi are teaming with sharks.. Angarosh in particular is known for schools of Hammerheads. But for a truly spectacular diving experience you need to go to the Deep South, where...

Absolutely - I agree 100%.

If you're ready to go back to the Red Sea then Sudan Deep South - Suakin Islands is pretty much guaranteed sharks (and everything else)... practically on every dive. Check these guys out: Home - Donquesto and this specific itinerary: Pagina non trovata - Donquesto

The thing about narcosis is that there really are several variables - environmental as well as personal that will affect your susceptibility. For example, I routinely conduct dives to 55m on air in warm water, with plenty of light and visibility and virtually no current... I hardly notice...

Now that we've discussed the definitions of technical and recreational can we move on to what DIR is ? :D

If you are referring to the Deep South Suakin Islands you will not be disappointed! I have done the trip a couple of times and am booked to go again in April 2016 for two weeks with Don Questo. If any of you are considering this trip I very highly recommend it ! The diving is spectacular and...

Ok I see what you mean. Yes, when you mentioned O2 window, Mark Powell's definition with respect to accelerated deco came to my mind as well. My understanding of it is that by increasing the gradient between the tissue tensions and the inspired inert-gas pressure this would result in a faster...

Of the two I would choose the Philippines by a long shot. They have some of the highest biodiversity on the plantet and exceptional diving.

I'm currently reading the recently published Deep Into Deco by Asser Salama. This is an excellent overview of decompression theory with some of the most recent theoretical models being discussed and used. There is an entire chapter devoted to Nitrox with some more recent findings on the...

I'm not sure what you mean... could you explain this a little more? Thanks

You could add deploy SMB, buddy breath (I know it's no longer required but I think it's still a good skill to have), and holding safety/deco stop with perfect trim and buoyancy. As a matter of fact all the skills you listed above should all be done while maintaining your position and trim in...

The benefits of O2 over EAN 80 are really not that much, at least for "moderate" dives in terms of efficiency, deco time, etc.. In some places like here in Aqaba and other parts of the Red Sea that offer Nitrox as a deco gas, it's been my experience that 80% is by and large the standard on...

Hello Saif, There are a few good dive centers in Aqaba, however, I would recommend Sinai Divers - Aqaba. They are located inside the Movenpick Resort in Tala Bay. My niece received her Junior OW with them and they have an excellent safety record, efficient and friendly staff, and are very...

Man that is really unfortunate and I hope you haven't done any permanent damage... hopefully in time everything will heal properly and you can safely return to diving. In the future it's good not only to equalize early and equalize often, but should you find that you've forgotten to equalize...

Why not get BP/Wing for singles before you get into tech? it's still a great option and all you'll have to do is just get a doubles wing when you're ready to move forward.