Preperation for a deep dive...

[junior diver]

Oh no thats surface supplied. Sorry.

 

[Snowbear]

...A 4 minute stop at 90fsw on 50%. A 9minute stop at 80fsw on 50%. A 12minute stop at 70fsw and a 18 minute stop at 60, 50 and 40fsw all on 50%. Then at 30fsw its 36minutes on 100% and a 20fsw 66 minutes on 100% again. But this is what it says on the tables and its just occoured to me that 30fsw is too deep to use 100% isn't it?

Good start, junior. However, you may want to re-check some of those MOD's

 

[junior diver]

That's what I thought when it said 100% at 30ft because isn't that about 10mtrs and the deepest you can use it is 6 mtrs. I've found out thats surface supplied.

 

[Snowbear]

That's what I thought when it said 100% at 30ft because isn't that about 10mtrs and the deepest you can use it is 6 mtrs. I've found out thats surface supplied.

The 90' on 50% is high as well. For SCUBA anyhow.

 

[breals]

This schedule will take you a couple of years, if you are very aggresive.

1) Find a buddy who has the same goals and is available to dive regularly; like every weekend.

2) Dive with your buddy, alot.

3) Take an advanced diving course to evaluate where you exactly are in your skill level. Work on teamwork. Practice on those areas on shallow dives, just enjoy yourself and getting comfortable.

4) MASTER YOUR BOUYANCY.

5) Take a Nitrox/Hyperoxic Trimix Course with your buddy.

6) Keep diving, alot and enjoy yourself. Start doing deeper dives and work on your team work and decompression stops.

7) Clear out your bank account because it's about to get expensive. Start buying the gear that you will want to replace by now. Get a drysuit, double steel tanks and stage bottles at a minimum. Even in the tropics we dive a dry suit at 200 ft for the thermal considerations. Start eyeing that scooter, you know that you'll want one.

8) Take a cave course with your buddy. Even if you never want to go into a cave again after this dive, the skills that you learn are applicable to a steel cave (aka a penetration wreck dive).

9) Take a full trimix course with your buddy.

10) At this point, you'll know what you need to work on and how to plan this dive.

 

[junior diver]

Check the navy manual. Thats what it says. It's surface supplied heliox by the way.

 

[Snowbear]

Check the navy manual. Thats what it says. It's surface supplied heliox by the way.

I'm sure you're correct -as you stated, for surface supplied helmet diving by a healthy sailor. As I said in my first post - it was a good start. Now you need to research a bit more. You should find that for most of us on self contained underwater breathing apparatus, the PPO2s on the schedule you proposed make the risk of a toxicity event too high to be considered even remotely safe.

 

[breals]

Check the navy manual. Thats what it says. It's surface supplied heliox by the way.

Remeber the Navy Manual is, for the most part, hard hat diving, not open circuit scuba. OxToxing is not fatal, drowning is fatal, unless you have gills and if that case you wouldn't have to worry about decompression at all.

On dry land you can Oxtox, it's like a grand mal seizure. You do that underwater, you'll spit your reg out and most likely drown. In a hard hat, they just adjust your mix and/or bring you up to the surface to fix this issue. Also, at 40 or 60 feet, they bring you up to the surface and you get stuffed in a chamber to finish out your decompression.

Decompression is much different when it's all in-water and tech/sport divers don't have the luxury of a chamber, so you have to keep your PPo2s in a more conservative range. 50% @ 70ft and 100% @ 20 feet are usually the deepest you would take that mix, regardless of what the Navy manual says.

 

[junior diver]

I know that. 20ft I think is still too deep to use 100% isn't it? I was quoting the manual which someone recommended using. I will soon know when I can find some proper tables for tech/sport divers.

 

[Seabear70]

This schedule will take you a couple of years, if you are very aggresive.

1) Find a buddy who has the same goals and is available to dive regularly; like every weekend.

Working on that, Actually I want to put together a 4 man team to provide additional redundency.

2) Dive with your buddy, alot.

3) Take an advanced diving course to evaluate where you exactly are in your skill level. Work on teamwork. Practice on those areas on shallow dives, just enjoy yourself and getting comfortable.

Agreed, if for nothing else than as a refresher. I'm finding that my math skills are a little rusty.

4) MASTER YOUR BOUYANCY.

Always a work in progress...

5) Take a Nitrox/Hyperoxic Trimix Course with your buddy.

That I'm reasonably comfortable with, but I may not have a buddy who is as comfortable with it.

6) Keep diving, alot and enjoy yourself. Start doing deeper dives and work on your team work and decompression stops.

7) Clear out your bank account because it's about to get expensive. Start buying the gear that you will want to replace by now. Get a drysuit, double steel tanks and stage bottles at a minimum. Even in the tropics we dive a dry suit at 200 ft for the thermal considerations. Start eyeing that scooter, you know that you'll want one.

It's kind of a diving family with a lot of diving friends, Gear we gots. One of the things I am considering is a custom built scooter that can carry multiple sets of stage bottles with QD connections to facilitate gas changes and ease carying so much gear. I may also work on a wired comm sustem for this unit.

8) Take a cave course with your buddy. Even if you never want to go into a cave again after this dive, the skills that you learn are applicable to a steel cave (aka a penetration wreck dive).

I am seriously considering that, though I'm not certain where I'd do that arround here.

9) Take a full trimix course with your buddy.

I've been doing a lot of studying on rec/tech trimix. A lot of the science being applied to it is sounding kinda shaky to me.

10) At this point, you'll know what you need to work on and how to plan this dive.

Roger, Wilco...