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What are the differences between GUE and ISE(InnerSpaceExplorer)?
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GUE is a much more established organization. ISE's founder and president, Achim Schlöffel was dismissed by GUE for teaching OC while in a re-breather configuration which GUE considers unsafe.
What are the differences between GUE and ISE(InnerSpaceExplorer)?
ALOT of instructors have quit or been "dismissed" by GUE for varies things. Some meritous some completely BS.