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<html> At 03:22 AM 1/18/99 +0100, you wrote: <br> <font color=3D"#006600"><blockquote type=3Dcite cite>When i started the discussion i was not referring to 400 feet dives in strong currents. I was referring to my every week end dives which is to 200 feet for 15-20 min in no currents.=A0=A0 In the case of this kind of diving with less than 20 min of deco in no currents and in the conditions we dive you would drift at most 100m during your deco. 2 boats would bee good to have but not=A0 necessary to do it safely.</font></blockquote><br> <br> <br> <font color=3D"#000000">In the past I may have agreed with you here,but of late I have seen where a chase boat would be of good use in all deco diving no matter what the depth, but sometimes it is not available and yes I would do a dive with out it ,but the boat does not leave all for the one ,he will be got after the others are on board ,they did not cause his problem,if he is having a life problem then you must go and if something happens to the others you will look foolish.<br> <br> <br> <br> </font><font color=3D"#006600"><blockquote type=3Dcite cite>Yes i failed to mention what kind of dive is was referring to. Read the my mail to Jim cob.=A0 I do agree that 2 boats is the only safe way=A0 to do it in most situations. Now as we all agree on this lets drop that part of the discussion.</font><font color=3D"#000000"> </blockquote><br> agreed<br> <br> </font><font color=3D"#006600"><blockquote type=3Dcite cite>I do not as my primary plan send a lift bag. That would bee a very dangerous practices.=A0 On the contrary i take all the precautions i can to avoid it. I use a shot line instead of anchor line as my ascent line to avoid having to send a bag. The anchor line is more likely to pull free as the shot line is tied off to the wreck and does not have a 20 ton boat pulling it.</font></blockquote><br> <font color=3D"#000000">Yes you are correct the boat is more likely to pull the hook than the shot line moving.Lift bags from beyond 250ft can be a dangerous plan and should be removed from ones plan at any depth to a secondary option<br> <br> </font><font color=3D"#006600"><blockquote type=3Dcite cite>What problem did you have?=A0=A0 The CO2 problem from swimming in currents at 400 feet i have solved with buying a Gavin scooter and getting in better shape. Swimming at 400 feet is not a good idea in my experience.=A0 Several divers had problems on the britannic 1997 expedition.=A0 I have done many cave dives to 300 feet and never had any problems with CO2 but 400 feet and strong currents was a different thing. The descent was really tiring as well, we had to work hard to get down due to the current and that helped building up CO2.=A0 Scooter is the way to go for these kind of dives. Not only does it eliminate any CO2 problems you can cover 5 times more of the wreck in a dive and the speed also means an added safety factor.</font><font color=3D"#000000">=A0</blockquote><br> You should know that CO2 can be a problem at alot less than 300ft ,doing work of any kind which I consider swimming work ,will cause problems ,the belief that one can skip breath to save gas will I believe, cause CO2 problems.I would like to answer openingly in details of the CO2 problem ,but I did send some of it to you privately ,I can not disclose any details as I sign a contract before the dive not to , but let it be said those in charge of that dive have never been on the boat since.<br> <br> <blockquote type=3Dcite cite><blockquote type=3Dcite cite>I have one questio= n what is the difference in pulling yourself down the anchor rope in a current and doing the same thing on your shot line?</font><font color=3D"#006600"></blockquote>No difference at all and i have not said it is either. Re read my post please.</font><font color=3D"#000000"> <br> And what is the difference in decoing on an anchor line and doing it on the permanent line to the wreck?Keep in mind I have said nothing about the hook pulling ,lets deal with these two=A0 details at a time.</font><font color=3D"#006600">No difference either </font></blockquote><br> <font color=3D"#000000">The hook pulling is a big deal ,but on a tech dive I have only seen the rope break once in 7-8 seas and the shackle come lose once on the chain when that happen everyone on the boat look for a camera to take a photo as they saw my lift bag and they had never seen me lose the anchor or do anything wrong ,but the joke was on them as I was tied to the wreck and they were drifting ,I have never seen the hook pull as on the dives that are deep great care is given to tieing it in and if it can not the dive is called off.You do not leave the line.You would not be able to leave the shot line if it were far off the wreck ,so you see the big in tack wrecks are a plus for you.<br> Also I do not believe in colors underwater,you did chose only two and yellow being one it was a safe choice ,but you know that a diver under stress would have sent the first bag up he got his hands on ,and that may have sent the wrong message up.Any bag to the surface from that dive should be a message that they need help and two divers with extra gas should go down, with one to stay and one to come back and=A0 tell the surface what is wrong.Stress is big problem and should be taken away from the dive ,having to send up the right colored bag adds more stress to what ever problem you are having ,any bag of any color on a dive like that is a message for help.<br> <br> Thanks <br> Capt.JT<br> </font> <BR> </html> -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. 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