Why do people add a few minutes to their last deco stop?

[ofg-1]

Its so you can get one last pee before you get out and it dribbles out of your pee valve in front of everyone.

 

[admikar]

Its so you can get one last pee before you get out and it dribbles out of your pee valve in front of everyone.

I figured out that if you eat a lot of mustard, pee will have nice neon tone to it. Producing some quite astonishing effects both in water and out of it.

 

[Tracy]

I figured out that if you eat a lot of mustard, pee will have nice neon tone to it. Producing some quite astonishing effects both in water and out of it.

I always wanted to put some fluorescein in my pvalve tube just to make it more entertaining during the dive.

 

[dmaziuk]

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[admikar]

I think it's safe to say that this thread, in best SB tradition, has gone down the tube?

 

[TrimixToo]

Better to add time to the surface "stop" (before climbing the ladder/stairs) if looking for additional conservatism. The off-gasing gradient is larger.

ETA: I only "pad" my last stop when my buddy is unable to ascend because of minor differences in profile, etc.

If you're on 100% O2 the off-gassing gradient cannot be improved by going any shallower than 20'.

 

[boulderjohn]

If you're on 100% O2 the off-gassing gradient cannot be improved by going any shallower than 20'.

Correct.

The advantage of staying at (or near) 20 feet when using O2 is managing bubble growth.

The advantages of going shallower are 1) using less gas during deco and 2) not having to be as careful about managing your depth to stay above high PPO2. I think the second benefit is especially nice because current recommendations for long deco include light exercise during deco to keep the blood flowing rather than imitating a statue of a sphynx.

 

[inquis]

on 100% O2 the off-gassing gradient cannot be improved by going any shallower than 20'.

No argument there. Furthermore (after 10 secs with a calculator), I see the "larger off-gasing gradient on the surface" doesn't hold for most accelerated deco gases. Even 50% is better above 19 ft.

Nonetheless, I do a surface "stop". It's nice to fully relax the muscles for a bit before the effort of getting out.

 

[L13]

Nonetheless, I do a surface "stop". It's nice to fully relax the muscles for a bit before the effort of getting out.

A surface stop is better than no surface stop. In addition to the subsurface stops!

 

[TrimixToo]

No argument there. Furthermore (after 10 secs with a calculator), I see the "larger off-gasing gradient on the surface" doesn't hold for most accelerated deco gases. Even 50% is better above 19 ft.

Nonetheless, I do a surface "stop". It's nice to fully relax the muscles for a bit before the effort of getting out.

For sure. Also, I usually stay on O2 until I'm reaching for the ladder or reach shore*, whichever happens first. Either way, it's the most exertion I should have post-dive.

* Except if the boat's gone, of course. I don't usually carry *that* much O2.