Eagles Nest Flow...

Hi,

I have yet to dive Eagles nest as I just recently got trimix certified. I do however have a few questions that the people of the board might be able to help me with. Not its not dive planning.... its about the flow in the nest. By refering to the Upstream and downstream sides I'm assuming that the upstream is springing and the downstream is siphoning. Is this correct? What magnitude of flow have people experianced? What about the lockwood tunnel? Also, looking at the maps it is unclear about the end of the lines. Do they just pinch off in a section too small to continue, stop with more cave ahead, or end in a room with no possible leads (please list EOL upstream, EOL downstream, EOL lockwood).

Thanks in advance!!!!

Very low, if any, flow.

As Forrest stated, there is little if any discernable flow. It is BIG cave so that serves to minimize discernability of the flow.

At some of the EOLs (upstream, downstream) it pinches down. At the Lockwood EOL it is a rubble pile -- it goes to a small bedding plane that more than likely leads to John's Pocket.

Since you are a new TRIMIX diver and new to the Nest I wouldn't think you'd be pushing EOLs on cave that averages ~260/~240.

The maps are "approximations".

The only flow that I ever noticed was while decoing in the tube. You sometimes notice the colder water coming down with tidal changes.

Either that, or last week the team above me had terrible buoyancy:smt079

Just kidding guys (If you're reading this):smt039

Cheers,

IMHO, any dive beyond the debris cone at The Nest is a very serious dive. I have a great deal of respect for the depths involved and the rate at which gas supplies diminish. Even if diving CCR technology you still have to plan for OC bailout at depth. My habit on OC is to never leave the cone with less than 300 CF of trimix gas on each diver, regardless of how far I plan on going up or downstream. Having never dived it CCR, although I plan to, I will have at least two 80AL or two 85 LP steel as BO.

If you don't know how flow relates to upstream and downstream, perhaps you want to look into less advanced sites to gain some real experience in caves...?

First, thanks for the replys. I have no plan to push the EOL's just curious. With some systems that have low flow it isn't uncommon for the tunnels to be miss labled and then kept that way for either historic sake or others references. I am quite familiar with how up stream and downstream correspond with cave systems.

I agree with outlaw caver gas goes so quickly, even when you turn on thirds by the time you are back at the debris cone and completed all your deep water stops you can be into that last third! For first dive I would plan on dropping to the cone at 140 and the going upstream a little ways depth comes quick by the time you hit the super room you should be thinking about turning. Just my advice. Have fun a great dive site. I choose 32% as my travel gas and that got me to the top of the cone. That gave me my bottom gas for the complete deep part of the dive.

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Originally Posted by Rikki Battistini

I agree with outlaw caver gas goes so quickly, even when you turn on thirds by the time you are back at the debris cone and completed all your deep water stops you can be into that last third! For first dive I would plan on dropping to the cone at 140 and the going upstream a little ways depth comes quick by the time you hit the super room you should be thinking about turning. Just my advice. Have fun a great dive site. I choose 32% as my travel gas and that got me to the top of the cone. That gave me my bottom gas for the complete deep part of the dive.

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No offense but you need to include those deep stops you are taking on back gas into your overall gas plan. If you are getting back to the debris cone and have less than 1/3 of your total gas remaining then you are not planning your gas correctly. Deep diving in particular requires extra planning and your need to pay particular attention to your gas reserves. If I were diving with you in the Nest (or anywhere for that matter) and on a non-event dive I found you with less 1/3 of your gas remaining when coming off of back gas we would have some serious discussion on the surface.

Dive safe!

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Originally Posted by SuPrBuGmAn

If you don't know how flow relates to upstream and downstream, perhaps you want to look into less advanced sites to gain some real experience in caves...?

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OK, I'll bite...how the heck do you know which side of hole in the wall is "downstream" when last time I was there I could have sworn they were both springing? :smt102