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This has been interesting, and points up several interesting points. 
We do a lot of tethered diving with several different types of 
tethers depending on what the reason is for the dive. Some times one 
on a line, sometimes two with a spliced Y shaped line, we use a 
slider where one diver can move up and down the line independent of 
the other diver. The concept of using a tether is not the only 
answere.  The concept of using a reel attached to an ice screw is 
interesting and straight out of the "cave comunity". Yet are there 
any cave divers that would tie off to  a tree root on the bank????????
?? The answere and reason is obvious. The same applies to ice diving. 
How about tieing off just inside the hole??? Aghhhhh if you have ever 
tried to put in an ice screw underwater  you know how rediculous this 
is. Furthermore if you have ever used an ice screw to keep the block 
from moving back into the hole you know how they loosen up and can 
fall out by themselves. Nice idea but probally not recomended.        
                                                                      
                                                                      
                                                                      
  Line signals!!!!!!!!!!!!!!!! if you read this list you should see 
the major problem every one has a beter way  and a different set of 
signals. Use the kiss principle and make sure each diver and each 
tender are on the same chanel with the same signals. Any more than 
three signals and you probally should be using Com gear and a surface 
communication unit.                                                   
                                                                      
                                                                      
                                                                      
Ice diving is not cave diving !!!!! it can be taylored to just about 
any level of diver, from the wetsuit diver to the tech deco diving 
maineacic. Adjustments must be made for the task at hand, and prehaps 
the most important part of the whole process is the surface supply 
with hot water hot soup and a warm place to change. DONOT 
underestimate the importance of the surface team. Ice diving is best 
handeled as a social event, where the question is not what is the 
least no. of divers it takes to do  an ice dive, but how many divers 
can we get through the hole in a day.
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