Thistlegorm on air

[buleetu]

diving nitrox makes no differance to gas cosumption no??

im really looking forward to diving the thistlegorm,it looks really amazing in all the pictures and videos, i was at jackson reef before on the outside looking for hammer heads and when we headed back to the reef i got to see the bits of the lara that are on the reef below,looked really cool, i hope to get to dive the thistlegorm this trip

 

[Red Sea Shadow]

diving nitrox makes no differance to gas cosumption no??

True. In normal conditions, the gas mix (air or Nitrox) has nothing to do with the consumption rate.

 

[buleetu]

okay i see. the first time i used air 28 i was getting longer bottom times and coming up with 50 and 60 bar instead of the usual 40 bar and then hanging out of the instructors alternate, i was convinced that my good gas consumption was got to do with the air 28, i was told it was a combination of things though, do u reckon me thinking that the air 28 made a differance actually made a differance to gas consumption

and also why do people say that using an instructors alternate is such a dangerous thing?? surely thats what its there for,i mean why would u wanna end the daive there and then without a safetly stop??

 

[ArthurGerla]

Most divers SAC will improve over time. The gas mix has no influence on this.

why do people say that using an instructors alternate is such a dangerous thing?

It keeps the the instructor or guide from attending to any other duties, and just plainly looks bad. Ending up on someones alternate means guide and guest failed to keep track of air consumption during the dive.

Dude, get the nitrox ticket. It's all in there.

 

[samaka]

If you think of it this way: The money you pay for a dive holiday and the number of minutes you spend in the water... devide and see how much each minute costs you. then ad the gained bottom time with nitrox and make the same calculation. Then you'll see that the nitrox course is worth the money.

...a...

 

[maged_mmh]

Bollocks. Any nitrox mix requires certification.

Please name the dive centre so we can avoid it in future.

That said: Diving the Thistlegorm on a day boat out of Sharm entails two morning dives with a short surface interval. You will definitely notice a significantly shorter no-deco limit on the second dive, and nitrox offers an obvious advantage here. The wreck lies in 30 meters of water, so it's safe to use the regular EAN32, though in Egypt that can mean anything in the 27-34 range.

why to avoid it?, nothing wrong if you used a mild mix as air-planned dive to have a narcosis offset.

thanks for your replies

bollox your self mate

i was there in september last year and out of 40 or 50 divers that went through in the 2 weeks i was there i think about 10 of them were certified nitrox divers

heres the link to subex have a read and post what u think and i wont be avoiding them at all,quite the opposite infact,u my friend feel free to avoid all u like though SUBEX Red Sea Diving Centers - The Art of Diving

i wouldnt imagine they are allowed to stick un certified divers into the water using air 28 without getting into trouble with the government in egypt, i think there very strict when it comes to dive safety or maybe im completly wrong about that i have seen some dodgey looking practices in egypt to tell the truth,but morally i wouldnt think a company like subex thats been around for so long and talks they way they do would be putting there customers at risk that easily, i have had this argument on the forum before about the un certified using this air 28 and im not having it again until u at least read the information on there website

wouldnt the air 28 give a longer bottom time, it is nitrox after all??????

actually I dived with them 2 year ago; very professional & friendly; a bit pricey though compared to other ops.
Now, if you're planning to extend your bottom time using EANx; get certified first.

 

[Seanpaul]

Listen to Samaka he knows what he is talking about. The current at Thistlegorm can and will rip your mask off. You may suck your air or nitrox simply due to this. I also assume this is why they do a short SI, from what I understand the current strengthens as the morning progresses and at 8am you may have 3 boats moored and at 9am you'll have 20. Do your nitrox course, you'll learn a lot, especially about partial pressure and oxygen toxicity. I took the written exam at 4am as our boat left the jetty on the way to the Thistlegorm. I don't regret it.

 

[ArthurGerla]

why to avoid it?:confused

Because they claim that you don't need a nitrox cert to dive this so-called 'SUBEX air28' mix. The name is misleading, and the practice is contrary to both PADI and CMAS standards.
You said it yourself: Get certified first.

 

[maged_mmh]

Because they claim that you don't need a nitrox cert to dive this so-called 'SUBEX air28' mix. The name is misleading, and the practice is contrary to both PADI and CMAS standards.
You said it yourself: Get certified first.

well if you gonna dive it as normal air (with computer set on air/using the air table) I seen no reason why not even if not EANx certified for EAN28 the ppO value is far too marginal to worry about given the rec limits.
BTW, as I said I dived with this op in SSHK.
for getting the benefits of EAN however like extended BT, and SI gain yes it is best to get certified; once done with just ride you computer after setting it to the correct mix you're using like all (most?) of us do.

 

[ianr33]

I guess diving 28% as normal air means you dont need to analyze it either?