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While a shot line is a time honored technique used by our friends across the pond, I must say that going down the anchor line is a technique which has been used successfully for many, many years over here in the Land of the Big PX. I can see and the advantages of using a shotline, certainly anyone who has had the thrill of "riding the anchor" will agree to this. But there are different techniques used for different conditions. Using the anchor line allows you to have a very nice setup of guide lines and hang bars that enable you deco very comfortably and allow divers to enter and exit the water at their leasure. Jim, you can have hang bars on a shot line as well. You just hang it in 2 buoys and from the buoys a line to the shot line and at appropriate depth a guide line to the shot line. . On deeper and longer dives we use this system. The deeper and longer the dive is the more complicated it gets obviously and we make plans accordingly. I certainly agree with Capt JT that it would be a very bad scenario with a diver drifting under a lift bag in a stiff current and you only had one boat that chases the bag and have to leave the rest of the divers on the shot line. But this is not how we do it. The type of dive i was originally referring to was the diving i most often do and that is 200 feet for 15-20min in absolutely no current. That gives about 15-20min of deco in no current and in the conditions we dive you would only drift very slightly, at most 100m. Then it is not much of a problem to have only one boat. When diving deep wrecks or in currents like capt JT referred to we use a different set up as i described in the Britannic dives. Then it is mandatory to have at least 2 boats and a different set up with safety divers, gas drop stations and more. I do not how ever think that the Jersey up line method would work on seriously deep wrecks with really strong currents. Quite a few wrecks around here have been depth-charged, wire-dragged and trawler dragged to death so it really does not matter where you hook up. Which ever technique you use I do think that having some sort of RIB in thes water is a critical safety factor. I agree 2 boats is mandatory to carry out deco wreck dives safely in most situations. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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