Which post for DIR?

CincyBengalsFan · Jun 24, 2002

Howdy all,

I have a quick question. Which post does the alternate come off of for DIR divers??? (Twin Tanks/manifold diving)

WreckWriter · Jun 24, 2002

backup comes off your left post, crosses behind your head then comes around to the front. bungeed around your neck so it rides under your chin.

Tom

CincyBengalsFan · Jun 24, 2002

Just doing a little investigation. Approx. 2 yrs. ago at Madison Blue down in Fla. 2 DIR cave divers died. They found that the left post had been rolled off from obviously bumping the ceiling. So when his buddy ran out of air the alternate did not work because it had been rolled off. SO.... Isn't it better to breath from the left post as a primary in case of roll off you know instantly? As the Right post can't roll off unless you go thru the cave backwards.

I'm sure this will stir up a hornets nest but it's the TRUTH.

roakey · Jun 24, 2002

Alternate comes off you left post. To do otherwise simplifes your life during a normal dive, when you can handle some complexity and makes things more complex and dangerous during an OOA situation, when you want things to be simple.

Exactly the opposite of what you want.

See: http://www.scubaboard.com/t9920/s.html for an in-depth discussion.

Roak

Uncle Pug · Jun 24, 2002

Originally posted by bengalsmgtsucks
2 DIR cave divers died. They found that the left post had been rolled off from obviously bumping the ceiling. So when his buddy ran out of air the alternate did not work because it had been rolled off.

Hi BMS...
There has got to be more to the story...
Not doubting you here but:
1) two divers died because one ran OOA?
2) the donor could not reach his left post to turn it back on?
2) they were DIR?

On the face of it... DIW is more like it.

But on to your question:

Isn't it better to breath from the left post as a primary in case of roll off you know instantly?

No, and to add to Roak's response...
What happens when you are transiting a restriction with the OOA buddy ahead of you and your long hose rolls off because it is on the left post? How would you know? How would he/she tell you?

ckharlan66 · Jun 24, 2002

BMS,

It is not a problem because you donate your primary (off the right post) in a OOA situation, that way the diver that is out of air doesn't have to worry about the post being rolled off since they have been without air longer. You would then go to your secondary and you could turn your air back on if it has been rolled off. It is more important to make sure the diver in trouble has a good air source, then you can deal with what ever you need to do to make sure you have air.

Chad

Divesherpa · Jun 24, 2002

How many opinions from this are from actual experience?

Most cave divers never make it to anything this restricted.

100days-a-year · Jun 24, 2002

Sherpa,I've seen a few who could have a roll-off in OW .You are of course correct that a very few will make the 3560' travel to the Hinkle and most will be to girthy to get thru.

CincyBengalsFan · Jun 24, 2002

Fellas,

Let's not get to upset over this. But a fact is that TWO DIR divers DIED approx. 2 yrs. ago a Madison Blue. DIR will not take responsibility for it. Conclusions drawn were that The donor went to his back up. Finds out that he is out of air on the back up or it's not on. INSTANT TUG-O-War match for the one reg that has air. Tug O War led to Two deaths. The left post had been rolled off due to bumping. Yes, There set up was exactly what DIR wanted. Yes they followed every step properly leading up to this. Part of the problem is that the permanent line they had been following had been spliced (Poorly) and had somehow split again at the splice. These divers apparently had NO idea it had been spliced in the first part. Regardless. Would this have happened if the donor had known his alternate had been rolled off?

Rick Murchison · Jun 24, 2002

It isn't DIR to die. Therefore they couldn't have been DIR. Do you have names & date; any reference in any accident investigation? I'd like to read up on this one.
Thanks,
Rick

Which post for DIR?

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CincyBengalsFan

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