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Steve,

   Lines between divers always creates an entanglement hazard and adds to the
tension of the dive if both divers are mobile - no one ever knows what it is
going to do next and keeping up with avoiding several of them sounds like a
nightmare.
   This whole picture you paint sounds like a leader with no confidence in the
qualifications of his charges or perhaps with his own ability to keep up with
them and control the dive.

   I would recommend a 3 man team in any overhead when possible.   The third
man is helpful if a crippled diver needs a lot of attention and help in that
he can keep track of navigating the way out while the other tends to the
victim.    Gas management and supply is more flexible and covers the
contingencies with a much greater safety margin.   The opportunity for a
division of labor can take some of the pressure off the diver with the most
stressful job in a crisis as well.   5 starts to up the task load of managing
the team to the point of diminishing returns; communication becomes time
consuming because it takes longer to get the message to everyone in the team
and confusion is more likely; vision ahead is often obstructed by other divers
in a cave and under ice in open water the field of view that must be covered
to monitor the entire team is task loading, tiring, and conducive to narcosis.
    In large groups divers will tend to team up into smaller groups anyway,
each focusing attention on less than the entire team - organization goes to
hell as soon as this happens and it is inevitable. 

Hope this helps,

Chuck Boone  


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