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When diving in extreme cold water conditions such as Antarctica or Far Northern
Canada, air containing helmets such as the DSI Superlites offer obvious warmth
advantages over FFM or bandmask configurations.  My question is this:  Are the
breathing characteristics of a full air containing helmet (ie. consumption
rate), prohibitive when considering their use with SCUBA (either open or closed
circuit)?

Comments?

-Sean T. Stevenson

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