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No, I think it depends on the person and the dive - certainly within the 100' or so range. I wouldn't bother with trimix for Caribbean reef dives in the 100' range, but for North Sea wrecks where you have currents, visibility below 6', holes dynamited into wrecks which make unintentional...

That's not true - I'll bash Scubapro and Atomics too :D

I'd agree about the sharing air drills - everyone should be practising that regularly (I wonder how many do?). I don't really see shutting down valves as a single tank diver skill - in fact it's not really a "no-deco limit" diver's skill. If you have a free flow which is not easily and quickly...

Yes, he is. Breathing from a free-flowing air source which is rapidly emptying your tank and is likely to stop within a minute or so is not a stable situation. The first priority should be to get a reliable source of air, then begin to work on the problem. Going to a pony or your buddy's...

The DTD/DIR-Zone Stream 20 (44 lbs) would also be a good choice, and probably cheaper than the Halcyon.

Only GUE instructors, as far as I know. Think it's every three years.

That, without accurate statistical gathering we really have no idea whether casualty rates are going up, down or sideways. The BSAC has been gathering accident statistics for the UK for years and is perhaps one of the better indicators of trends. Their figures show a steady increase in...

Not a problem. As I say, I already have DSAT TecRec Deep which gives all Nitrox mixes and 100% O2. If only GUE would hurry up and get their Rec TriOx course going is would solve all these problems :)

A little thing called decompression.

Why not Apeks? They are excellent regulators and will accommodate pretty much any level of tech diving you will ever do. If you ever look at a group of cold water tech divers it always seems at least 75% have an Apeks DS4/ATX50 or similar setup.

Novel is certainly one word for it.

Are you sure you were reading it right? Most computers, when they hit deco, give you a "don't shallower than 10 feet" warning, but they don't tell you to immediately go there - they just give you the shallowest depth you can safely ascend to at that point.

I'd consider doing the PADI Scuba Diver (not OW Diver) course. This course is basically half the full OW course and qualifies you to make OW dives under direct supervision of a divemaster or instructor - and let's face it, even most OW divers who only dive on holiday generally dive under DM...

:rofl3: :rofl3: So, driving a couple of hundred kilometers and an 8 hour round trip on the boat don't really worry you, but using less Helium than a typical children's party does. Anyway, if you want to save the planet, don't have kids; nothing else makes any realistic difference.

Well, it certainly sounds like something you need a doctor's opinion on, but I very much doubt it's DCS. Generally you expect DCS symptoms within an hour of diving and certainly within 24 hours. If you had no symptoms for a week then DCS seems unlikely. Furthermore, the depths and times for...

I suppose that depends on whether you're finning along a warm coral reef or making a North Sea wreck dive; I do the latter.

Does one of the TDI trimix courses cover the use of (or provide a c-card for the use of) hyperoxic trimix (e.g. 30/30 for dives to the 36m range). I can only see details of normoxic and hypoxic trimix training.

Dive definitions (for PADI): For training purposes, an open water dive is a dive during which a student diver spends the majority of time at a depth of at least 5 metres/15 feet and: a. breathes at least 1400 litres or 50 cubic feet of compressed gas. OR b. remains submerged for at least...

The easiest way to reach behind you is to use your buddy. If you manage to both lose your buddy AND get entangled then maybe diving isn't really your thing... but we can discuss that later on the Accidents forum. :D

Well, there's possibly some commercial diving where engineering is needed, but given the sort of decompression schedules, bone necrosis and memory problems commercial divers seem to have to put up with I'm not sure I'd want to do that. Still, engineering - ever think of manufacturing dive...