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Ok folks - discussion time! I have just spent the last two weeks diving the Draeger Atlantis 1. I have what is considered a reasonable knowledge of semi-closed and closed circuit systems. It has been a fun two weeks. The units are very simple in construction - the thing is I am begining to think somebody is winding us all up. For those that are unfamiliar with the system it comprises a cylinder containing a given Eanx mix which feeds a breathing bag via a fixed mass flow rate metering unit (the flow rate being dependant upon the oxygen content of the mix - 4 flow rate orifices are available 32,40,50 and 60% Eanx). There is an automatic bypass valve which injects into the bag should you bottom the lung by either descending too rapidly or metabolising more oxygen via extreme workloads. The breathed gas flows into a small exhalation bag with an overpressure valve then into the scrubber and back into the inhalation bag - simple!. The adjustment of the overpressure valve will alter the bleed off pressure ( remeber we are talking semi-closed here) hence the volume of the inhalation bag. There are no electronics whatsoever - the unit relies on the brain of the diver in respect of it's operational envelope. The point I'm trying to make here is that up to now I've only been exposed to electronic all-singing-all-dancing closed circuit systems.This thing is so simple and devoid of extras it is a peach - have we been dragged into a technological desire for an expensive hammer to crack a small nut - you tell me?. PS Downside it has no application for deep exposures with the current design. I have little technical information on the Oddessy, and would appreciate comments from those that have. Regards Chris
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