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| Originally Posted by [b Quote[/b] (Mark Chase @ Jan. 08 2004,18:17)] |
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| Originally Posted by [b Quote[/b] ]So my question is how do you do exploritory dives without a tool like the VR3. DIR is all about Cave's so if you want to push another 1000m into a deep cave complex how do you plan it. You have little or no idea what dephs you will be faced with or how long the travers of the cave will take.
Even on a 'normal' cave dive how would you plan or cope with a lost line serch at say 80m where deco is racking up at a masive rate. |
Mark
You know better than to say "DIR is all about caves". DIR works for all kinds of diving blah, blah, blah!
For a regular cave dive, you will "know" the depth, because it is fixed, so the dive plan is based on time only. The dive is called on gas, time or comfort level etc. I have a set of tables and I select the appropriate table for the depth we are diving. So, lets imagine we dive a cave to a max depth of 30m, we might have a 20m table and a 30m table. We will agree in advance when to call the dive (on terms of gas or time). So when we get to our first deco stop we look at our tables and run a schedule based on depth and time. If our average depth was 20m we would run the 20m table. It's quite often difficult to do set stops like in the ocean because of the profile of the cave so we agree what we will do in advance. The cave profile dictates where the deco is done.
You can communicate what schedule to run with simple hand signals (i.e. a 60 min schedule or a 70 min schedule).
Pushing "an extra 1000m into a cave" is a bit ambitious!
As far as the lost line scenario goes.....If you are lost, off the line (probably in zero vis) at 80m and you've lost your team too, deco is the least of your worries!
Hope this helps. Happy to discuss more but I don't have any experience of cave exploration. I can only imagine how the deco is planned for this sort of dive.
Bob