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This question may be a little off the subject
and a little naive but I have always wondered
about this...

Wrolf writes..

The anchor line is generally used as the descent line.  A few captains drop
a Danforth anchor in the sand, pay out line, and drop a seperate descent
line.  But currents can run 4 knots, wind and currents can shift while
some divers are down.  So the common procedure is to grapple the wreck
directly, and the first diver down ties in the otherwise very insecure
grapple anchor.  The last diver frees it.


If all the divers have widely different profiles, the wreck is large,
and visibility is poor how are you sure your the "last diver".

NOTE: I've never made a planned decompression dive.

Bob

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