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John >Names written on them can help, and insistence on everyone putting their >own up and not sharing gives simple indication of numbers up. This would >allow a surface cover crew to act before anyone has surfaced and >possibly prevent a loss. We certainly had a death in Scapa which could >have been avoided with this sysem. We have our names on them and each person deploys their own DSMB for the reasons you state and to allow the skipper to know that it is safe to recover the shot line. I did a drift deco for 6 miles on one occasion, being a skipper yourself, I'm sure you'll appreciate these caring little gestures :) >We now have a policy on board and I know that Al Wright is thinking >along the same lines that the first thing on long dives is to return to >a station on the shot line etc etc. The DSMB system is to be used as a >back up in case of non return to the shot. Most of our diving is wreck so we tend not to be far from the shot anyway. However, if the current is running, there is a possibility of the divers threading out in an extended line if they do not leave the bottom at the same (or similar) time. To minimise this, those doing the bottom time enter first. However, if we have lower visibility surface conditions or if we are near a shipping lane, we will come back to the shot, though this is rare. I also dive with the High Wycombe Trimix boys and they occasionally use a deco station attached to the main shot with a lazy shot. This system works well apart from the hassle of getting back to a shot. Their system has a red and green float on a pulley system to indicate to the skipper that all divers are on the deco station or that one or more have not returned and he should keep an eye out for the divers that did not make it back to the shot. The usual system of clipping a marker on the way down and removing it on the way up is used. If your marker is the last there then all divers are on the deco station and the lazy shot can be unclipped from the main shot allowing the deco station to become a drift deco station. David Shimell Project Manager, Sequent Computer Systems Ltd, Weybridge, UK Email: shimell@se*.co* -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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