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In my first reply about using lines in the bass I did not suggest that a permanent line be left, but rather that permanent tie off points be identified or placed in the wreck that can be used to quickly lay a line during a penetration. These tie off points in caves are often pitons which I suppose would not work in a wreck, but lead weights might; however if the machinery tends to move aroud alot this might not be useful. On this point, in the latest South Pacific Undesea Medical Society journal there was an article reprinted from technical diver which was an analysis of 'technical diving' accidents The author suggested that there was resistance amoung the cave diving community to the use of guidelines, I don't have the issue in front of me so I cannot give an accurate citation or quotation. Can anyone comment on this? On the applicability of cave diving techniques to wreck diving I must agree with J.Heimann, wreck diving is alot different. I am primarily a cave diver as there is not much wreck diving in South Australia, but I have done a couple hundred wreck dives of the East Coast of the US (not many penetrations) in the late seventies and middle eighties and I not familiar with how things are done these days. In comparison to wreck divers, cave divers have it fairly easy in regards to surface water conditions. Similarly the overhead environment is more treacherous inside a wreck than inside a cave. Despite this I believe that some cave diving guideline techniques should apply to wreck diving. I understand that in we use reels much more here in Australia, elsewhere permanent lines are more common. Reel and guideline use is a skill that must be practiced and used frequently to be safe and effective. David Doolette
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