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It's amazing how posts can digress! My original post was based on the claim, by Jupitermermaid, that Nitrox could lead one to a "CO2 overload" and thus not alerting the diver to OOA or LOA. O2 toxicity is not the issue here (and wasn't for the deceased diver, as she was quite shallow on...

Thanks for the reply. I fully understand how the CO2 hit happens, having suffered same once. What I don't understand is how the extra O2 can make one more susceptible to the hit, any more than air can. Surely the higher concentration of O2 in the bloodstream would mean that a hit would...

Please explain your thinking here. I would like to understand how a Nitrox mix could lead to a CO2 buildup. In any case, what a tragedy. My heart goes out to her, and to those left behind. Thanks, Seadeuce

Check the following list for info.: http://www.scuba.ie/centres/index.htm April is usually very good for visibility, with water temps around 12degsC (54F). There is a good variety of diving to be had. When you decide on a place to visit, do a search on divesites for that area. You might be...

When entering by a backroll from a boat (90% of my dives are done this way) instead of popping up to the surface immediately, as most divers do because their BC is inflated, do two fin-kicks while on your back and about three feet underwater. You will then allow adequate space for any following...

Sorry to jump in here, but which system works best with neoprene cuff seals? Seadeuce

MMB for me Seadeuce

SSI do one I believe Seadeuce

Back in 1996 I booked a certain liveaboard (OH) on the basis of their advertising that they were doing dives for advanced divers - and I don't mean AOWs! We had one person aboard with only 30 dives up. Never got to Peleliu or Siaes Tunnel. Had some good dives there but I will never...

Having been a DAN member for twelve years I can say I have never heard where they have failed to do good. But I prefer to be a member and have their feeling obliged to help me, if ever I should need them. So far, so good! Seadeuce

Having been in these air chambers: is it possible that the tank valve was inadvertently closed down by contact/rubbing with part of the overhead environment? Maybe while you were chatting to your buddy - were you "bumping" against the roof of the cave? Easily done, and with four chamber exits...

If a reg freeflows you CAN breathe from it. Allow the excess air to go out the side of your mouth. You will have very cold teeth on reaching the surface, but the reg will get you up. On the other hand it is easier for you to switch to your own octopus/Air II/AutoAir or whatever AAS you may...

Kinking a hose is not an option. You just will not be able to get the hose to do so. I had an LP hose blow on me a few years ago and there was no alternative but to ascend and turn off the air (in that order). Apeks produce a freeflow control device that attaches to your hose just next to...

Interesting you should say there was sickness aboard. On my trip in October 2006 eleven of sixteen were sick. Fortunately I escaped. We blamed the water dispenser - someone must have touched the nozzle with his/her hands. I would change to another boat if going again. Thanks for the...

[/I] Always glad to offer a qualified opinion. Reading between the lines of your text, I like the way you think. A thinking diver is a safer diver. You'll do well. Stay Wet Seadeuce

Just a few thoughts and comments from an experienced coldwater diver in the hope that it will provoke some serious discussion between you and your buddy. Firstly, congrats on getting back okay. Yes, it is advisable to have sealed regs when diving in cold water. However, even sealed regs...

I see where milk crates are used for transporting the X. Appreciate the dimensions of the crate - L x B x H - as we don't have these crates over here. I must get a suitable crate to carry one in . I know, should measure the X etc., but it's still in its box. TIA Seadeuce

Thanks for that Seadeuce

Sorry if I didn't make myself clear - my question was: how practical is it to travel from Nuweiba to Dahab for diving in one day? I am with a group of non-divers and have to re-join them that night. One hour's taxi + 8hrs for diving time + one hour back Is this realistic, or should...

I have just found out that I will be in Nuweiba next Monday 31st on a trip that takes me across Sinai to Jordan. Would I be pushing it to travel from there to Dahab for the day, or better to stay in Nuweiba and dive there? If in Nuweiba which centre would you recommend? TIA Seadeuce