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Just get a petrel and be done with it.

Positive buoyancy > negative buoyancy of the object. Am I missing something?

petrel 1 ext for sale - rebreather world For Sale Petrel 1 brand new for sale - CCRX

And a petrel on rbw or ccrx, I don't recall which.

Of course one failing is not going to cause the other to fail! But if one is free flowing the second one attached to the same air source is not going to much good to you for very long.

Yes, the one attached to your pony or other redundant air source. A second stage will generally fail open, so another one attached to the same tank is of little use.

The computer is also a Liquivision not Liquidvision. Not doing your credibility any favours :)

Can't help you on that, sorry. If you ever want to dive a sunken oil rig in Western Australia also called Key Biscayne I might be more use

Key Biscayne Western Australia? Or Key Biscayne Florida?

If you have doubts about its ability to tell depth, I doubt it will calculate NDL's etc.

And for anybody who has not seen this before and is thinking of breathing off their wing, even just "for fun or practice" This has been posted plenty of times before but it can't hurt to post again...

Never used the gloves, but the socks are super warm. Kept my toes toasty in Antarctica.

Another pony bottle thread...... How many different ways do you want to skin a cat. My favorite http://m.simplyscuba.com/products/Metalsub/PonyQuickRelease.aspx One side stays on the tank cam band, the other on the bottle. Clip on and off as required. No dramas when changing main bottles.

You had to go there didn't you?? :) :)

Having just done (3 weeks ago) multiple flights through DFW and Miami, both international-international connections and international-domestic connections you have plenty of time. Unless of course you plane coming in is 2hours late.... It sounds like you are a bit apprehensive about air...

I wear my computers on different wrists and swim with one arm up and the other down, seems to keep the NDL about the same on both. :)

I was being deliberately simplistic. It would just be another form of O2 concentrator, just instead of absorbing N2 into zeolite and venting it as waste, you would absorb O2 and then vent it as the end product. Depending on the viability of the process, mainly energy input vs gas produced per...

I think the greatest potential is for getting pure O2 for my breather in remote locations. I also read it will release the O2 into a near vacuum; so (in simplistic terms) A) take a sheet of the stuff and wave it around to absorb O2 B) stuff said sheet into a vacuum canister C) Apply suction...

Harmless fun. I wish I was anywhere near as good at free diving as that!

I saw someone with a suunto on a dive trip. She got locked out of her suunto, ignored it, swapped it with a loan unit (which obviously had no record of her gas loading). Kept diving, ended up in a chamber. Can't protect everyone.