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What level of narcosis are you prepared to accept?
- Up to 40m - but less on the bottom
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Up to you but pushing it with three 12ltr stages IMHO
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What is your breathing rate?
- 12 for the bottom, 9 for deco (im not planning on swimming anywhere)
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Egypt is not like the UK slack is unpredictable so are up currents and down currents. My SAC is about the same as yours and plan 15 to allow a margin of error but again this is your choice.
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What failures are you going to plan for?
- loss of one or more deco tanks - Yellow blob + slate to send down more. I use a double wing, two DSMBs, two reels, two computers, two masks, Manifolded twins with a slobnob, bailout slates.
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Take your own slob knob but check what manifolds they have, as it might not fit.
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What level of PPO2 are you prepared to accept for back gas and deco gas?
- Up to 1.6 for either, finally depends on total CNS
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1.6 for back gas? Surely not it would make the CNS silly.
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What kind of support and backup do you have available?
- Surface cover to be confirmed, but I want to be capable of doing the dive without needing their assistance - perhaps a hang tank of O2. They will be rebreather/OC Tmx trained and ready.
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DONT use a hang tank without a diver on hand to protect it. There are so many scobydoos about and they do the strangest things
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Who is your buddy?
- no one
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They wouldn’t / shouldn’t let you do it.
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What decompression model are you going to use?
- VR3, with bailouts using Proplanner or V-planner
Do you want to make any changes to that decompression model?
- I may depending upon others advice maximise my O2 window, last stop at 3m. But will intend to use the actual from the VR3 on the dive. The bailouts would only be used if both computers went wrong.
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If your going to use the Buhlmann based VR3 for the dive your bail out must also be Buhlmann based so avoid Vplanner.
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How much conservativism do you want to apply to your deco?
- 20% VR3 / + 2 on V-Planner
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My 2p Run the VR3 on 0% and mentally add your own conservatism. You can add as much as you like but taking it away in an emergency will bend it and task load you.
We used 13/65 because we bounced the 102 bit so PP02 wasn’t a major issue. I would say 11/60 would be a better choice of your planning on staying at 100 for any period of time.
We used 21/20 travel and deep deco but in hind sight I would up this to 21/35
Then we used 32% Nitrox and 80% Nitrox for deco. 100% is going to mean short fills. and 50% put too much pressure on the bail out plans and the travel gas so we stuck to 32 & 80. Using 80 meant we didn’t need air breaks and didn’t have to factor the back gas into our bail out plans.
What’s the dive site and what are you expecting to do at 100m for 20mins?
Also note my Suunto computer craped out at 100m telling me I was at 116 m. These depths put quite a strain on the equipment. Fortunately I took three computers
ATB
Mark Chase