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Raimo,

I feel that you missed Dr Neil's points.  Firstly, the technique 
described is used as standard.  Secondly, an implied point is that the 
current over here when the tide starts running is seldom as gentle as 2 
knots making it unrealistic to contemplate hanging on a fixed line.  
Thirdly, in you scenario, if all divers are drifting together, it would 
not take a competent skipper (slightly better qualified than a 
"Captain"??) very long to call out a helicopter, call for assistance 
from another boat or calculate the approximate position of the drifting 
divers.  The downside in your scenario is that you might have to spend 
an hour or so drifting in a known direction at a known speed having left 
from a known position at a time known within a few minutes.

As has also been mentioned, the delayed surface markers are purpose 
designed, they stick out of the water 3 or 4 feet and are of a day-glow 
type colour.  They can be seen from well over a mile.  For wrecks a long 
way off shore (20+ miles) it is also normal for more than 1 dive boat to 
be present.  All commercial UK dive boats HAVE to carry life boats.  
Most UK divers diving off shore also carry flares.  The lowest level of 
diver that is qualified to dive with another of equal grade over here 
has most probably done at least 30 dives (that makes him a Master Scuba 
Expert Diver Trainer???) and that diver is not doing deco.....

Please don't assume that the conditions we dive in over here are the 
same as yours just because the ocean is the same.

Harry.

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