BADBOY69

'Freespool', first of all, welcome to the sport! I've seen some of your post in other areas and look forword to seeing some reports back from your diving, you'll add alot here. As to your question, nothing is wrong with hanging a stage tankfor use in an emergency. I think I understood your post correctly...having a tank with a reg attached to thedescent line ata specified depth for use in the event of an, "Oh, sh!t" incident.Of course, a pony bottle or bail-out setupyou sling on you or your rig is wise so that you don'thave to worry about trying to find the line in orderto utilize your safety plan. But, like you said, what if there was a rare occasion when you had to ditch everything or everything failed...why not do both? Then you have a backup to your backup! There is nothing wrong with implementing that as part of your dive routine, just practicedeploying and using the system. There is no diving style that is TOO safe, in my opinion! Again, glad to have you over here and hope this helps.

Clay-Doh

Forgot what charter it is..Think it may be Beerbunder? Anyways, they have a tank and rig set up at the top of the tower on the O. So at about 70 feet if there is an emergency, there is a rig. I think thats a great idea. Dalton has bottles slung down at 20 feet on his, which in a case as with Swander, is still great because he can add a safety margin by being able to off-gas while still under 1.60 atmospheres of pressure, and much lessening the chance of bends.



Even better yet (with proper training) is pure O2 slung at that depth, if you have a computer that can switch to pure O2, and can be switched to a new mix while underwater. Talk about watching your nitrogen disappear right before your eyes.



Theoretically speaking, you could assend on one "breath" of air from any depth, say 1,000 feet. At 1000 feet, 1 lungfull of air has as much gas at that depth as 30.30 lungfulls at the surface. An accent from 100 feet on a breath of air is actually 3 breathfulls of air. Its the time factor involved on fast you have to ascend because from a depth of 100 feet it should take exactly 2 minutes and 40 seconds to reach the surface based on 60 fpm accent rate from 100-60 feet, and 30 fpm from 60 feet to 0. (I know I know, the book teaches 30 fpm accent regardless of depth, and good to follow. It is industry acceptable to ascend 60fpm at depths greater than 60. I personally ascend about 15 feet per minute though). With a stagfe bottle at 20 feet, that cuts total "safe" accent time down to 2 minutes, plus allows you to do a safety stop, which would be more like a decompression stop due to the faster than "safe and acceptable" accent rate that you would probably have done.



I have been meaning to get one of them lil spare airs that provides aprox 20 breaths of air. Very small with its own reg mounted on top, takes up almost zero room. Considering the expanding lungs and air, that would be plenty to get me to the surface safely.



My name is Clay, and I am an addict. I in no way advocate decompression diving or use of O2. Or accent rates of 60 fpm at depths greater than 60'. And always dive within 10 feet of your buddy.

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BOHUNTER1

I like 20 foot of line with a tank attached/reg attached. If ya got one why not drop it down....most can see the boat above but the current and anchor line may be way out front and 100 feet away, this would give a good anchor point for a safety stop.... Im learning..

Yall gotta get me on a boat and teach a newbie some new stuff, Josh and Rich ..well Ive used up all their passed on knowledge!

Clay-Doh

We'll get you out there Bohunter!

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deepcelineman

if your gonna dive alone should not even be an option unless teatherd to topside an no line pull signals are comms dive buddys are the best way an safe way its just not worth it